Apollo 13

This article is about the 1970 spaceflight. For the film based upon it, seeApollo 13(film).For other uses, seeApollo 13 (disambiguation).

Apollo 13

Odyssey's damagedservice module,as seen from theApollo Lunar ModuleAquarius,hours before reentry
Mission type	Crewed lunar landing attempt (H)
Operator	NASA
COSPAR ID	CSM: 1970-029A LM: 1970-029C
SATCATno.	4371
Mission duration	5 days, 22 hours, 54 minutes, 41 seconds
Spacecraft properties
Spacecraft	Apollo CSM-109 Apollo LM-7
Manufacturer	CSM:North American Rockwell LM:Grumman
Launch mass	44,069 kg (CSM: 28,881 kg;LM: 15,188 kg)
Landing mass	5,050 kilograms (11,133 lb)
Crew
Crew size	3
Members	James A. Lovell Jr. John L. Swigert Jr. Fred W. Haise Jr.
Callsign	CSM:Odyssey LM:Aquarius
Start of mission
Launch date	April 11, 1970, 19:13:00(1970-04-11UTC19:13Z)UTC
Rocket	Saturn VSA-508
Launch site	Kennedy LC-39A
End of mission
Recovered by	USSIwo Jima
Landing date	April 17, 1970, 18:07:41(1970-04-17UTC18:07:42Z)UTC
Landing site	South Pacific Ocean 21°38′24″S165°21′42″W
Flyby of Moon(orbit and landing aborted)
Closest approach	April 15, 1970, 00:21:00 UTC
Distance	254 kilometers (137 nmi)
Docking with LM
Docking date	April 11, 1970, 22:32:08 UTC
Undocking date	April 17, 1970, 16:43:00 UTC
Jim Lovell,Jack Swigert,Fred Haise Apollo program

Apollo 13(April 11–17, 1970) was the seventh crewed mission in theApollo space programand the third meant to land on the Moon. The craft was launched fromKennedy Space Centeron April 11, 1970, but the lunar landing was aborted after an oxygen tank in theservice module(SM) ruptured two days into the mission, disabling its electrical andlife-support system.The crew, supported by backup systems on thelunar module(LM), instead looped around the Moon in acircumlunar trajectoryand returned safely to Earth on April 17. The mission was commanded byJim Lovell,withJack Swigertascommand module(CM) pilot andFred Haiseaslunar module(LM) pilot. Swigert was a late replacement forKen Mattingly,who was grounded after exposure torubella.

A routine stir of an oxygen tank ignited damaged wire insulation inside it, causing an explosion that vented the contents of both of the SM's oxygen tanks to space.Without oxygen, needed for breathing and for generating electric power, the SM's propulsion and life support systems could not operate. The CM's systems had to be shut down to conserve its remaining resources for reentry, forcing the crew to transfer to the LM as a lifeboat. With the lunar landing canceled, mission controllers worked to bring the crew home alive.

Although the LM was designed to support two men on the lunar surface for two days,Mission Controlin Houston improvised new procedures so it could support three men for four days. The crew experienced great hardship, caused by limited power, a chilly and wet cabin and a shortage ofpotable water.There was a critical need to adapt the CM's cartridges for thecarbon dioxide scrubbersystem to work in the LM; the crew and mission controllers were successful in improvising a solution. The astronauts' peril briefly renewed public interest in the Apollo program; tens of millions watched thesplashdownin theSouth Pacific Oceanon television.

An investigative review board found fault with preflight testing of the oxygen tank andTeflonbeing placed inside it. The board recommended changes, including minimizing the use of potentially combustible items inside the tank; this was done forApollo 14.The story of Apollo 13 has been dramatized several times, most notably in the 1995 filmApollo 13based onLost Moon,the 1994 memoir co-authored by Lovell – and an episode of the 1998 miniseriesFrom the Earth to the Moon.

Background

In 1961, U.S. PresidentJohn F. Kennedychallenged his nation to land an astronaut on theMoonby the end of the decade, with a safe return to Earth.NASAworked towards this goal incrementally, sending astronauts into space duringProject MercuryandProject Gemini,leading up to theApollo program.The goal was achieved withApollo 11,which landed on the Moon on July 20, 1969.Neil ArmstrongandBuzz Aldrinwalked on the lunar surface whileMichael Collinsorbited the Moon inCommand ModuleColumbia.The mission returned to Earth on July 24, 1969, fulfilling Kennedy's challenge.

NASA had contracted for fifteenSaturn Vrockets to achieve the goal; at the time no one knew how many missions this would require.Since success was obtained in 1969 with the sixth SaturnV on Apollo 11, nine rockets remained available for a hoped-fortotal of ten landings.After the excitement of Apollo 11, the general public grew apathetic towards the space program and Congress continued to cut NASA's budget;Apollo 20was canceled.Despite the successful lunar landing, the missions were considered so risky that astronauts could not afford life insurance to provide for their families if they died in space.

Mission Operations Control Room during the TV broadcast just before the Apollo 13 accident. AstronautFred Haiseis shown on the screen.

Even before the first U.S. astronaut entered space in 1961, planning for a centralized facility to communicate with the spacecraft and monitor its performance had begun, for the most part the brainchild ofChristopher C. Kraft Jr.,who became NASA's firstflight director.DuringJohn Glenn's MercuryFriendship 7flight in February 1962 (the first crewed orbital flight by the U.S.), one of Kraft's decisions was overruled by NASA managers. He was vindicated by post-mission analysis and implemented a rule that, during the mission, the flight director's word was absolute– to overrule him, NASA would have to fire him on the spot.Flight directors during Apollo had a one-sentence job description, "The flight director may take any actions necessary for crew safety and mission success."

In 1965, Houston'sMission Control Centeropened, in part designed by Kraft and now named for him.In Mission Control, each flight controller, in addition to monitoringtelemetryfrom the spacecraft, was in communication via voice loop to specialists in a Staff Support Room (or "back room" ), who focused on specific spacecraft systems.

Apollo 13 was to be the secondH mission,meant to demonstrate precision lunar landings and explore specific sites on the Moon.With Kennedy's goal accomplished by Apollo 11, andApollo 12demonstrating that the astronauts could perform a precision landing, mission planners were able to focus on more than just landing safely and having astronauts minimally trained in geology gather lunar samples to take home to Earth. There was a greater role for science on Apollo 13, especially for geology, something emphasized by the mission's motto,Ex luna, scientia(From the Moon, knowledge).

Astronauts and key Mission Control personnel

Swigert, Lovell and Haise the day before launch

Position	Astronaut
Commander (CDR)	James A. Lovell Jr. Fourth and last spaceflight
Command Module Pilot (CMP)	John "Jack" L. Swigert Jr. Only spaceflight
Lunar Module Pilot (LMP)	Fred W. Haise Jr. Only spaceflight

Apollo 13's mission commander,Jim Lovell,was 42 years old at the time of the spaceflight. He was a graduate of theUnited States Naval Academyand had been a naval aviator andtest pilotbefore being selected for thesecond group of astronautsin 1962; he flew withFrank BormaninGemini 7in 1965 and Buzz Aldrin inGemini 12the following year before flying inApollo 8in 1968, the first spacecraft to orbit the Moon.At the time of Apollo 13, Lovell was the NASA astronaut with the most time in space, with 572 hours over the three missions.

Jack Swigert,the command module pilot (CMP), was 38 years old and held aB.S.in mechanical engineering and anM.S.in aerospace science; he had served in the Air Force and in stateAir National Guardsand was an engineering test pilot before being selected for thefifth group of astronautsin 1966.Fred Haise,the lunar module pilot (LMP), was 35 years old. He held a B.S. in aeronautical engineering, had been aMarine Corpsfighter pilot, and was a civilian research pilot for NASA when he was selected as a Group5 astronaut.

According to the standard Apollo crew rotation, the prime crew for Apollo 13 would have been the backup crewforApollo 10,with Mercury and Gemini veteranGordon Cooperin command,Donn F. Eiseleas CMP andEdgar Mitchellas LMP.Deke Slayton,NASA's Director of Flight Crew Operations, never intended to rotate Cooper and Eisele to a prime crew assignment, as both were out of favor – Cooper for his lax attitude towards training, and Eisele for incidents aboardApollo7and an extramarital affair. He assigned them to the backup crew because no other veteran astronauts were available.Slayton's original choices for Apollo 13 wereAlan Shepardas commander,Stuart Roosaas CMP, and Mitchell as LMP. However, management felt Shepard needed more training time, as he had only recently resumed active status after surgery for aninner ear disorderand had not flown since 1961. Thus, Lovell's crew (himself, Haise andKen Mattingly), having all backed up Apollo 11 and being slated forApollo 14,was swapped with Shepard's.

Swigert was originally CMP of Apollo 13's backup crew, withJohn Youngas commander andCharles Dukeas lunar module pilot.Seven days before launch, Duke contractedrubellafrom a friend of his son.This exposed both the prime and backup crews, who trained together. Of the five, only Mattingly was not immune through prior exposure. Normally, if any member of the prime crew had to be grounded, the remaining crew would be replaced as well, and the backup crew substituted, but Duke's illness ruled this out,so two days before launch, Mattingly was replaced by Swigert.Mattingly never developed rubella and later flew onApollo 16.

For Apollo, a third crew of astronauts, known as the support crew, was designated in addition to the prime and backup crews used on projects Mercury and Gemini. Slayton created the support crews becauseJames McDivitt,who would commandApollo 9,believed that, with preparation going on in facilities across the US, meetings that needed a member of the flight crew would be missed. Support crew members were to assist as directed by the mission commander.Usually low in seniority, they assembled the mission's rules,flight plan,and checklists, and kept them updated;for Apollo 13, they wereVance D. Brand,Jack Lousmaand eitherWilliam PogueorJoseph Kerwin.

For Apollo 13, flight directors wereGene Kranz,White team(the lead flight director);Glynn Lunney,Black team;Milton Windler,Maroon team andGerry Griffin,Gold team.TheCAPCOMs(the person in Mission Control, during the Apollo program an astronaut, who was responsible for voice communications with the crew)for Apollo 13 were Kerwin, Brand, Lousma, Young and Mattingly.

Mission insignia and call signs

Apollo 13 flown silverRobbins medallion

The Apollo 13 mission insignia depicts the Greek god of the Sun,Apollo,with three horses pulling his chariot across the face of the Moon, and the Earth seen in the distance. This is meant to symbolize the Apollo flights bringing the light of knowledge to all people. The mission motto,Ex luna, scientia( "From the Moon, knowledge" ), appears. In choosing it, Lovell adapted the motto of his alma mater, the Naval Academy,Ex scientia, tridens( "From knowledge, sea power" ).

On the patch, the mission number appeared inRoman numeralsas Apollo XIII. It did not have to be modified after Swigert replaced Mattingly, as it is one of only two Apollo mission insignia – the other being Apollo 11 – not to include the names of the crew. It was designed by artistLumen Martin Winter,who based it on a mural he had painted for theSt. Regis Hotelin New York City.The mural was later purchased by actorTom Hanks,who portrayed Lovell in the movieApollo 13,and it is now in theCaptain James A. Lovell Federal Health Care Centerin Illinois.

The mission's motto was in Lovell's mind when he chose the call signAquariusfor the lunar module, taken fromAquarius,the bringer of water.Some in the media erroneously reported that the call sign was taken froma song by that namefrom the musicalHair.The command module's call sign,Odyssey,was chosen not only for itsHomeric associationbut to refer to the recent movie,2001: A Space Odyssey,based ona short storybyscience fictionauthorArthur C. Clarke.In his book, Lovell indicated he chose the nameOdysseybecause he liked the word and its definition: a long voyage with many changes of fortune.

Due to the accident and the last minute crew change of Jack Swigert replacing Ken Mattingly three days prior to launch, the Apollo 13Robbins medallionsflown aboard the mission were melted down and reminted after the mission to reflect the correct crew, and the absence of a lunar landing date.

Space vehicle

CSM-109Odysseyin theOperations and Checkout Building

The Saturn V rocket used to carry Apollo 13 to the Moon was numbered SA-508, and was almost identical to those used on Apollo8 through 12.Including the spacecraft, the rocket weighed in at 2,949,136 kilograms (6,501,733 lb).TheS-ICfirst stage's engines were rated to generate 440,000 newtons (100,000 lbf) less total thrust than Apollo 12's, though they remained within specifications.To keep itsliquid hydrogenpropellent cold, theS-IIsecond stage's cryogenic tanks were insulated; on earlier Apollo missions this came in the form of panels that were affixed, but beginning with Apollo 13, insulation was sprayed onto the exterior of the tanks.Extra propellant was carried as a test, since futureJ missionsto the Moon would require more propellant for their heavier payloads. This made the vehicle the heaviest yet flown by NASA, and Apollo 13 was visibly slower to clear the launch tower than earlier missions.

The Apollo 13 spacecraft consisted of Command Module 109 and Service Module 109 (together CSM-109), calledOdyssey,and Lunar Module7 (LM-7), calledAquarius.Also considered part of the spacecraft was thelaunch escape system,which would propel the command module (CM) to safety in the event of a problem during liftoff, and the Spacecraft–LM Adapter, numbered as SLA-16, which housed the lunar module (LM) during the first hours of the mission.

The LM stages, CM and service module (SM) were received atKennedy Space Center(KSC) in June 1969; the portions of the Saturn V were received in June and July. Thereafter, testing and assembly proceeded, culminating with the rollout of the launch vehicle, with the spacecraft atop it, on December 15, 1969.Apollo 13 was originally scheduled for launch on March 12, 1970; in January of that year, NASA announced the mission would be postponed until April 11, both to allow more time for planning and to spread the Apollo missions over a longer period of time.The plan was to have two Apollo flights per year and was in response to budgetary constraintsthat had recently seen the cancellation of Apollo 20.

Training and preparation

Lovell practices deploying the flag

The Apollo 13 prime crew undertook over 1,000 hours of mission-specific training, more than five hours for every hour of the mission's ten-day planned duration. Each member of the prime crew spent over 400 hours in simulators of the CM and (for Lovell and Haise) of the LM at KSC and at Houston, some of which involved the flight controllers at Mission Control.Flight controllers participated in many simulations of problems with the spacecraft in flight, which taught them how to react in an emergency.Specialized simulators at other locations were also used by the crew members.

The astronauts of Apollo 11 had minimal time for geology training, with only six months between crew assignment and launch; higher priorities took much of their time.Apollo 12 saw more such training, including practice in the field, using a CAPCOM and a simulated backroom of scientists, to whom the astronauts had to describe what they saw.Scientist-astronautHarrison Schmittsaw that there was limited enthusiasm for geology field trips. Believing an inspirational teacher was needed, Schmitt arranged for Lovell and Haise to meet his old professor,Caltech'sLee Silver.The two astronauts, and backups Young and Duke, went on a field trip with Silver at their own time and expense. At the end of their week together, Lovell made Silver their geology mentor, who would be extensively involved in the geology planning for Apollo 13.Farouk El-Bazoversaw the training of Mattingly and his backup, Swigert, which involved describing and photographing simulated lunar landmarks from airplanes.El-Baz had all three prime crew astronauts describe geologic features they saw during their flights between Houston and KSC; Mattingly's enthusiasm caused other astronauts, such as Apollo 14's CMP, Roosa, to seek out El-Baz as a teacher.

Concerned about how close Apollo 11's LM,Eagle,had come to running out of propellant during its lunar descent, mission planners decided that beginning with Apollo 13, the CSM would bring the LM to the low orbit from which the landing attempt would commence. This was a change from Apollo 11 and 12, on which the LM made the burn to bring it to the lower orbit. The change was part of an effort to increase the amount of hover time available to the astronauts as the missions headed into rougher terrain.

The plan was to devote the first of the two four-hour lunar surfaceextravehicular activities(EVAs) to setting up theApollo Lunar Surface Experiments Package(ALSEP) group of scientific instruments; during the second, Lovell and Haise would investigateCone crater,near the planned landing site.The two astronauts wore their spacesuits for some 20 walk-throughs of EVA procedures, including sample gathering and use of tools and other equipment. They flew in the "Vomit Comet"in simulated microgravity or lunar gravity, including practice in donning and doffing spacesuits. To prepare for the descent to the Moon's surface, Lovell flew theLunar Landing Training Vehicle(LLTV) after receiving helicopter training.Despite the crashes of one LLTV and one similar Lunar Landing Research Vehicle (LLRV) prior to Apollo 13, mission commanders considered flying them invaluable experience and so prevailed on reluctant NASA management to retain them.

Experiments and scientific objectives

Lovell (left) and Haise during geology training in Hawaii, January 1970

Apollo 13's designated landing site was nearFra Mauro crater;theFra Mauro formationwas believed to contain much material spattered by the impact that had filled theImbrium basinearly in the Moon's history. Dating it would provide information not only about the Moon, but about the Earth's early history. Such material was likely to be available at Cone crater, a site where an impact was believed to have drilled deep into the lunarregolith.

Apollo 11 had left aseismometeron the Moon, but the solar-powered unit did not survive its first two-week-long lunar night. The Apollo 12 astronautsalso left oneas part of its ALSEP, which was nuclear-powered.Apollo 13 also carried a seismometer (known as the Passive Seismic Experiment, or PSE), similar to Apollo 12's, as part of its ALSEP, to be left on the Moon by the astronauts.That seismometer was to be calibrated by the impact, after jettison, of the ascent stage of Apollo 13's LM, an object of known mass and velocity impacting at a known location.

Other ALSEP experiments on Apollo 13 included aHeat Flow Experiment(HFE), which would involve drilling two holes 3.0 metres (10 ft) deep.This was Haise's responsibility; he was also to drill a third hole of that depth for a core sample.A Charged Particle Lunar Environment Experiment (CPLEE) measured the protons and electrons of solar origin reaching the Moon.The package also included a Lunar Atmosphere Detector (LAD)and a Dust Detector, to measure the accumulation of debris.The Heat Flow Experiment and the CPLEE were flown for the first time on Apollo 13; the other experiments had been flown before.

Haise practices removing the fuel capsule from its transport cask mounted on the LM. The real cask sank unopened into the Pacific Ocean with its radioactive contents.

To power the ALSEP, theSNAP-27radioisotope thermoelectric generator (RTG) was flown. Developed by theU.S. Atomic Energy Commission,SNAP-27 was first flown on Apollo 12. The fuel capsule contained about 3.79 kilograms (8.36 lb) ofplutonium oxide.The cask placed around the capsule for transport to the Moon was built with heat shields of graphite and of beryllium, and with structural parts of titanium and ofInconelmaterials. Thus, it was built to withstand the heat of reentry into the Earth's atmosphere rather than pollute the air with plutonium in the event of an aborted mission.

A United States flag was also taken, to be erected on the Moon's surface.For Apollo 11 and 12, the flag had been placed in a heat-resistant tube on the front landing leg; it was moved for Apollo 13 to the Modularized Equipment Stowage Assembly (MESA) in the LM descent stage.The structure to fly the flagon the airless Moon was improved from Apollo 12's.

For the first time, red stripes were placed on the helmet, arms and legs of the commander'sA7Lspacesuit. This was done as, after Apollo 11, those reviewing the images taken had trouble distinguishing Armstrong from Aldrin, but the change was approved too late for Apollo 12.New drink bags that attached inside the helmets and were to be sipped from as the astronauts walked on the Moon were demonstrated by Haise during Apollo 13's final television broadcast before the accident.

Apollo 13's primary mission objectives were to: "Perform selenological inspection, survey, and sampling of materials in a preselected region of the Fra Mauro Formation. Deploy and activate an Apollo Lunar Surface Experiments Package. Develop man's capability to work in the lunar environment. Obtain photographs of candidate exploration sites."The astronauts were also to accomplish other photographic objectives, including of theGegenscheinfrom lunar orbit, and of the Moon itself on the journey back to Earth. Some of this photography was to be performed by Swigert as Lovell and Haise walked on the Moon.Swigert was also to take photographs of theLagrangian pointsof the Earth-Moon system. Apollo 13 had twelve cameras on board, including those for television and moving pictures.The crew was also to downlinkbistatic radarobservations of the Moon. None of these was attempted because of the accident.

Flight of Apollo 13

Thecircumlunar trajectoryfollowed by Apollo 13, drawn to scale. The accident occurred about 56 hours into the mission.

Launch and translunar injection

Apollo 13 launches from Kennedy Space Center, April 11, 1970

Apollo 13 spacecraft configuration during most of the journey: Click on image for key to numbered components.

The mission was launched at the planned time, 2:13:00 pmEST(19:13:00 UTC) on April 11. An anomaly occurred when the second-stage, center (inboard) engine shut down about two minutes early.This was caused by severepogo oscillations.Starting with Apollo 10, the vehicle's guidance system was designed to shut the engine down in response to chamber pressure excursions.Pogo oscillations had occurred onTitan rockets(used during theGemini program) and on previous Apollo missions,but on Apollo 13 they were amplified by an interaction with turbopumpcavitation.A fix to prevent pogo was ready for the mission, but schedule pressure did not permit the hardware's integration into the Apollo 13 vehicle.A post-flight investigation revealed the engine was one cycle away from catastrophic failure.The four outboard engines and theS-IVBthird stage burned longer to compensate, and the vehicle achieved very close to the planned circular 190 kilometers (100 nmi)parking orbit,followed by a translunar injection (TLI) about two hours later, setting the mission on course for the Moon.

After TLI, Swigert performed the separation and transposition maneuvers before docking the CSMOdysseyto the LMAquarius,and the spacecraft pulled away from the third stage.Ground controllers then sent the third stage on a course to impact the Moon in range of the Apollo 12 seismometer, which it did just over three days into the mission.

The crew settled in for the three-day trip to Fra Mauro. At 30:40:50 into the mission, with the TV camera running, the crew performed a burn to place Apollo 13 on a hybrid trajectory. The departure from afree-return trajectorymeant that if no further burns were performed, Apollo 13 would miss Earth on its return trajectory, rather than intercept it, as with a free return.A free return trajectory could only reach sites near the lunar equator; a hybrid trajectory, which could be started at any point after TLI, allowed sites with higher latitudes, such as Fra Mauro, to be reached.Communications were enlivened when Swigert realized that in the last-minute rush, he had omitted to file hisfederal income tax return(due April 15), and amid laughter from mission controllers, asked how he could get an extension. He was found to be entitled to a 60-day extension for being out of the country at the deadline.

Entry into the LM to test its systems had been scheduled for 58:00:00; when the crew awoke on the third day of the mission, they were informed it had been moved up three hours and was later moved up again by another hour. A television broadcast was scheduled for 55:00:00; Lovell, acting as emcee, showed the audience the interiors ofOdysseyandAquarius.The audience was limited since none of the television networks were carrying the broadcast,forcing Marilyn Lovell (Jim Lovell's wife) to go to the VIP room at Mission Control if she wanted to watch her husband and his crewmates.

Accident

For the cause of the accident, seeApollo 13 § Investigation and response.

About six and a half minutes after the TV broadcast – approaching 56:00:00 – Apollo 13 was about 180,000 nautical miles (210,000 mi; 330,000 km) from Earth.Haise was completing the shutdown of the LM after testing its systems while Lovell stowed the TV camera.Jack Lousma,theCAPCOM,sent minor instructions to Swigert, including changing theattitudeof the craft to facilitate photography ofComet Bennett.

The pressure sensor in one of the SM's oxygen tanks had earlier appeared to be malfunctioning, soSy Liebergot(theEECOM,in charge of monitoring the CSM's electrical system) requested that the stirring fans in the tanks be activated. Normally this was done once daily; a stir woulddestratifythe contents of the tanks, making the pressure readings more accurate.The Flight Director, Kranz, had Liebergot wait a few minutes for the crew to settle down after the telecast,then Lousma relayed the request to Swigert, who activated the switches controlling the fans,and after a few seconds turned them off again.

Ninety-five seconds after Swigert activated those switches,the astronauts heard a "pretty large bang", accompanied by fluctuations in electrical power and the firing of the attitude control thrusters.Communications and telemetry to Earth were lost for 1.8 seconds, until the system automatically corrected by switching thehigh-gainS-bandantenna, used for translunar communications, from narrow-beam to wide-beam mode.The accident happened at 55:54:53 (03:08 UTC on April 14, 10:08 PM EST, April 13). Swigert reported 26 seconds later,"Okay, Houston, we've had a problem here,"echoed at 55:55:42 by Lovell, "Houston, we've had a problem. We've had a Main B Bus undervolt."William Fenner was theguidance officer(GUIDO) who was the first to report a problem in the control room to Kranz.

Lovell's initial thought on hearing the noise was that Haise had activated the LM's cabin-repressurization valve, which also produced a bang (Haise enjoyed doing so to startle his crewmates), but Lovell could see that Haise had no idea what had happened. Swigert initially thought that ameteoroidmight have struck the LM, but he and Lovell quickly realized there was no leak.The "Main Bus B undervolt" meant that there was insufficientvoltageproduced by the SM's threefuel cells(fueled by hydrogen and oxygen piped from their respective tanks) to the second of the SM's two electric power distribution systems. Almost everything in the CSM required power. Although thebusmomentarily returned to normal status, soon both buses A and B were short on voltage. Haise checked the status of the fuel cells and found that two of them were dead. Mission rules forbade entering lunar orbit unless all fuel cells were operational.

In the minutes after the accident, there were several unusual readings, showing that tank2 was empty and tank1's pressure slowly falling, that thecomputer on the spacecrafthad reset and that the high-gain antenna was not working. Liebergot initially missed the worrying signs from tank2 following the stir, as he was focusing on tank1, believing that its reading would be a good guide to what was present in tank2, as did controllers supporting him in the "back room". When Kranz questioned Liebergot on this, he initially responded that there might be false readings due to an instrumentation problem; he was often teased about that in the years to come.Lovell, looking out the window, reported "a gas of some sort" venting into space, making it clear that there was a serious problem.

Since the fuel cells needed oxygen to operate, when Oxygen Tank1 ran dry, the remaining fuel cell would shut down, meaning the CSM's only significant sources of power and oxygen would be the CM's batteries and its oxygen "surge tank". These would be needed for the final hours of the mission, but the remaining fuel cell, already starved for oxygen, was drawing from the surge tank. Kranz ordered the surge tank isolated, saving its oxygen, but this meant that the remaining fuel cell would die within two hours, as the oxygen in tank1 was consumed or leaked away.The volume surrounding the spacecraft was filled with myriad small bits of debris from the accident, complicating any efforts to use the stars for navigation.The mission's goal became simply getting the astronauts back to Earth alive.

Looping around the Moon

This depiction of a direct abort (from a 1966 planning report) contemplates returning from a point much earlier in the mission, and closer to Earth, than where the Apollo 13 accident occurred.

NASA – Apollo 13 Lunar Mission – Views Of The Moon (2:24)

The lunar module had charged batteries and full oxygen tanks for use on the lunar surface, so Kranz directed that the astronauts power up the LM and use it as a "lifeboat"– a scenario anticipated but considered unlikely.Procedures for using the LM in this way had been developed by LM flight controllers after a training simulation for Apollo 10 in which the LM was needed for survival, but could not be powered up in time.Had Apollo 13's accident occurred on the return voyage, with the LM already jettisoned, the astronauts would have died,as they would have following an explosion in lunar orbit, including one while Lovell and Haise walked on the Moon.

A key decision was the choice of return path. A "direct abort" would use the SM's main engine (theService Propulsion Systemor SPS) to return before reaching the Moon. However, the accident could have damaged the SPS, and the fuel cells would have to last at least another hour to meet its power requirements, so Kranz instead decided on a longer route: the spacecraft would swing around the Moon before heading back to Earth. Apollo 13 was on the hybrid trajectory which was to take it to Fra Mauro; it now needed to be brought back to a free return. The LM'sDescent Propulsion System(DPS), although not as powerful as the SPS, could do this, but new software for Mission Control's computers needed to be written by technicians as it had never been contemplated that the CSM/LM spacecraft would have to be maneuvered from the LM. As the CM was being shut down, Lovell copied down its guidance system's orientation information and performed hand calculations to transfer it to the LM's guidance system, which had been turned off; at his request Mission Control checked his figures.At 61:29:43.49 the DPS burn of 34.23 seconds took Apollo 13 back to a free return trajectory.

The Apollo 13 crew photographed the Moon out of theLunar Module.

The change would get Apollo 13 back to Earth in about four days' time – though with splashdown in theIndian Ocean,where NASA had few recovery forces. Jerry Bostick and otherFlight Dynamics Officers(FIDOs) were anxious both to shorten the travel time and to move splashdown to thePacific Ocean,where the main recovery forces were located. One option would shave 36 hours off the return time, but required jettisoning the SM; this would expose the CM's heat shield to space during the return journey, something for which it had not been designed. The FIDOs also proposed other solutions. After a meeting involving NASA officials and engineers, the senior individual present,Manned Spaceflight CenterdirectorRobert R. Gilruth,decided on a burn using the DPS, that would save 12 hours and land Apollo 13 in the Pacific. This "PC+2" burn would take place two hours afterpericynthion,the closest approach to the Moon.At pericynthion, Apollo 13 set the record (per theGuinness Book of World Records), which still stands, for the furthest distance from Earth by a crewed spacecraft: 400,171 kilometers (248,655 mi) from Earth at 7:21 pm EST, April 14 (00:21:00 UTC April 15).

While preparing for the burn, the crew was told that the S-IVB had impacted the Moon as planned, leading Lovell to quip, "Well, at least something worked on this flight."Kranz's White team of mission controllers, who had spent most of their time supporting other teams and developing the procedures urgently needed to get the astronauts home, took their consoles for the PC+2 procedure.Normally, the accuracy of such a burn could be assured by checking the alignment Lovell had transferred to the LM's computer against the position of one of the stars astronauts used for navigation, but the light glinting off the many pieces of debris accompanying the spacecraft made that impractical. The astronauts accordingly used the one star available whose position could not be obscured – the Sun. Houston also informed them that the Moon would be centered in the commander's window of the LM as they made the burn, which was almost perfect – less than 0.3 meters (1 foot) per second off.The burn, at 79:27:38.95, lasted four minutes and 23 seconds.The crew then shut down most LM systems to conserve consumables.

Return to Earth

Swigert with the rig improvised to adapt the CM'slithium hydroxidecanisters for use in the LM

The LM carried enough oxygen, but that still left the problem ofremoving carbon dioxide,which was absorbed by canisters oflithium hydroxidepellets. The LM's stock of canisters, meant to accommodate two astronauts for 45 hours on the Moon, was not enough to support three astronauts for the return journey to Earth.The CM had enough canisters, but they were of a different shape and size to the LM's, hence unable to be used in the LM's equipment. Engineers on the ground devised a way to bridge the gap, using plastic covers ripped from procedure manuals, duct tape, and other items available on the spacecraft.NASA engineers referred to the improvised device as "the mailbox".The procedure for building the device was read to the crew by CAPCOMJoseph Kerwinover the course of an hour, and was built by Swigert and Haise; carbon dioxide levels began dropping immediately. Lovell later described this improvisation as "a fine example of cooperation between ground and space".

Lovell tries to rest in the frigid spacecraft

The CSM's electricity came from fuel cells that produced water as a byproduct, but the LM was powered bysilver-zinc batterieswhich did not, so both electrical power and water (needed for equipment cooling as well as drinking) would be critical. LM power consumption was reduced to the lowest level possible;Swigert was able to fill some drinking bags with water from the CM's water tap,but even assuming rationing of personal consumption, Haise initially calculated they would run out of water for cooling about five hours before reentry. This seemed acceptable because the systems of Apollo 11's LM, once jettisoned in lunar orbit, had continued to operate for seven to eight hours even with the water cut off. In the end, Apollo 13 returned to Earth with 12.8 kilograms (28.2 lb) of water remaining.The crew's ration was 0.2 liters (6.8 fl oz) of water per person per day; the three astronauts lost a total of 14 kilograms (31 lb) among them, and Haise developed aurinary tract infection.This infection was probably caused by the reduced water intake, but microgravity and effects of cosmic radiation might have impaired his immune system's reaction to the pathogen.

Apollo 13: Houston, We've Got a Problem(1970) — Documentary about the mission by NASA (28:21)

Inside the darkened spacecraft, the temperature dropped as low as 3 °C (38 °F).Lovell considered having the crew don their spacesuits, but decided this would be too hot. Instead, Lovell and Haise wore their lunar EVA boots and Swigert put on an extra coverall. All three astronauts were cold, especially Swigert, who had got his feet wet while filling the water bags and had no lunar overshoes (since he had not been scheduled to walk on the Moon). As they had been told not to discharge their urine to space to avoid disturbing the trajectory, they had to store it in bags. Water condensed on the walls, though any condensation that may have been behind equipment panelscaused no problems, partly because of the extensive electrical insulation improvements instituted after theApollo 1fire.Despite all this, the crew voiced few complaints.

Flight controllerJohn Aaron,along with Mattingly and several engineers and designers, devised a procedure for powering up the command module from full shutdown – something never intended to be done in flight, much less under Apollo 13's severe power and time constraints.The astronauts implemented the procedure without apparent difficulty: Kranz later credited all three astronauts having been test pilots, accustomed to having to work in critical situations with their lives on the line, for their survival.

Recognizing that the cold conditions combined with insufficient rest would hinder the time critical startup of the command module prior to reentry, at 133 hours into flight Mission Control gave Lovell the okay to fully power up the LM to raise the cabin temperature, which included restarting the LM's guidance computer. Having the LM's computer running enabled Lovell to perform a navigational sighting and calibrate the LM's Inertial Measurement Unit (IMU). With the lunar module's computer aware of its location and orientation, the command module's computer was later calibrated in a reverse of the normal procedures used to set up the LM, shaving steps from the restart process and increasing the accuracy of thePGNCS-controlled reentry.

Reentry and splashdown

Despite the accuracy of the transearth injection, the spacecraft slowly drifted off course, necessitating a correction. As the LM's guidance system had been shut down following the PC+2 burn, the crew was told to use the line between night and day on the Earth to guide them, a technique used on NASA's Earth-orbit missions but never on the way back from the Moon.This DPS burn, at 105:18:42 for 14 seconds, brought the projected entry flight path angle back within safe limits. Nevertheless, yet another burn was needed at 137:40:13, using the LM'sreaction control system(RCS) thrusters, for 21.5 seconds. The SM was jettisoned less than half an hour later, allowing the crew to see the damage for the first time, and photograph it. They reported that an entire panel was missing from the SM's exterior, the fuel cells above the oxygen tank shelf were tilted, that the high-gain antenna was damaged, and there was a considerable amount of debris elsewhere.Haise could see possible damage to the SM's engine bell, validating Kranz's decision not to use the SPS.The crew then moved out of the LM back into the CM and reactivated its life support systems.

Apollo 13 splashes down in the South Pacific on April 17, 1970

The last problem to be solved was how to separate the lunar module a safe distance away from the command module just before reentry. The normal procedure, in lunar orbit, was to release the LM and then use the service module's RCS to pull the CSM away, but by this point, the SM had already been released.Grumman,manufacturer of the LM, assigned a team ofUniversity of Torontoengineers, led by senior scientistBernard Etkin,to solve the problem of how much air pressure to use to push the modules apart. The astronauts applied the solution, which was successful.The LM reentered Earth's atmosphere and was destroyed, the remaining pieces falling in the deep ocean.Apollo 13's final midcourse correction had addressed the concerns of the Atomic Energy Commission, which wanted the cask containing the plutonium oxide intended for the SNAP-27 RTG to land in a safe place. The impact point was over theTonga Trenchin the Pacific, one of its deepest points, and the cask sank 10 kilometers (6 mi) to the bottom. Later helicopter surveys found no radioactive leakage.

Ionization of the air around the command module during reentry would typically cause a four-minute communications blackout. Apollo 13's shallow reentry path lengthened this to six minutes, longer than had been expected; controllers feared that the CM's heat shield had failed.Odysseyregained radio contact and splashed down safely in the South Pacific Ocean,21°38′24″S165°21′42″W,southeast ofAmerican Samoaand 6.5 km (3.5 nmi) from the recovery ship,USSIwo Jima.Although fatigued, the crew was in good condition except for Haise, who had developed a serious urinary tract infection because of insufficient water intake.The crew stayed overnight on the ship and flew toPago Pago,American Samoa,the next day. They flew to Hawaii, where PresidentRichard Nixonawarded them thePresidential Medal of Freedom,the highest civilian honor.They stayed overnight, and then were flown back to Houston.

En route to Honolulu, President Nixon stopped at Houston to award the Presidential Medal of Freedom to the Apollo 13 Mission Operations Team.He originally planned to give the award to NASA administratorThomas O. Paine,but Paine recommended the mission operations team.

Public and media reaction

Nobody believes me, but during this six-day odyssey, we had no idea what an impression Apollo13 made on the people of Earth. We never dreamed a billion people were following us on television and radio, and reading about us in banner headlines of every newspaper published. We still missed the point on board the carrierIwo Jima,which picked us up, because the sailors had been as remote from the media as we were. Only when we reached Honolulu did we comprehend our impact: there we foundPresident Nixonand [NASA Administrator]Dr. Paineto meet us, along with my wife Marilyn, Fred's wife Mary (who, being pregnant, also had a doctor along just in case), and bachelor Jack's parents, in lieu of his usual airline stewardesses.

— Jim Lovell

Worldwide interest in the Apollo program was reawakened by the incident; television coverage was seen by millions. Four Soviet ships headed toward the landing area to assist if needed,and other nations offered assistance should the craft have to splash down elsewhere.President Nixon canceled appointments, phoned the astronauts' families, and drove to NASA'sGoddard Space Flight CenterinGreenbelt, Maryland,where Apollo's tracking and communications were coordinated.

The rescue received more public attention than any spaceflight to that point, other than the first Moon landing on Apollo 11. There were worldwide headlines, and people surrounded television sets to get the latest developments, offered by networks who interrupted their regular programming for bulletins.Pope Paul VIled a congregation of 10,000 people in praying for the astronauts' safe return; ten times that number offered prayers at a religious festival in India.TheUnited States Senateon April 14 passed a resolution urging businesses to pause at 9:00pm local time that evening to allow for employee prayer.

An estimated 40million Americans watched Apollo13's splashdown, carried live on all three networks, with another 30million watching some portion of the 6½ hour telecast. Even more outside the U.S. watched.Jack GouldofThe New York Timesstated that Apollo13, "which came so close to tragic disaster, in all probability united the world in mutual concern more fully than another successful landing on the Moon would have".

Investigation and response

Review board

Oxygen tank number 2, showing heater and thermostat unit

Immediately upon the crew's return, NASA Administrator Paine and Deputy AdministratorGeorge Lowappointed a review board to investigate the accident. Chaired by NASALangley Research CenterDirectorEdgar M. Cortrightand including Neil Armstrong and six others,the board sent its final report to Paine on June 15. It found that the failure began in the service module's number2 oxygen tank.DamagedTefloninsulation on the wires to the stirring fan inside Oxygen Tank2 allowed the wires toshort circuitand ignite this insulation. The resulting fire increased the pressure inside the tank until the tank dome failed, filling the fuel cell bay (SM Sector4) with rapidly expanding gaseous oxygen and combustion products. The pressure rise was sufficient to pop the rivets holding the aluminum exterior panel covering Sector4 and blow it out, exposing the sector to space and snuffing out the fire. The detached panel hit the nearby high-gain antenna, disabling the narrow-beam communication mode and interrupting communication with Earth for 1.8 seconds while the system automatically switched to the backup wide-beam mode.The sectors of the SM were not airtight from each other, and had there been time for the entire SM to become as pressurized as Sector4, the force on the CM's heat shield would have separated the two modules. The report questioned the use of Teflon and other materials shown to be flammable in supercritical oxygen, such as aluminum, within the tank.The board found no evidence pointing to any other theory of the accident.

Panel similar to the SM Sector4 cover being ejected during a test performed as part of the investigation

Mechanical shockforced the oxygen valves closed on the number1 and number3 fuel cells, putting them out of commission.The sudden failure of Oxygen Tank2 compromised Oxygen Tank1, causing its contents to leak out, possibly through a damaged line or valve, over the next 130 minutes, entirely depleting the SM's oxygen supply.With both SM oxygen tanks emptying, and with other damage to the SM, the mission had to be aborted.The board praised the response to the emergency: "The imperfection in Apollo 13 constituted a near disaster, averted only by outstanding performance on the part of the crew and the ground control team which supported them."

Oxygen Tank 2 was manufactured by theBeech Aircraft Companyof Boulder, Colorado, as subcontractor toNorth American Rockwell(NAR) of Downey, California, prime contractor for the CSM.It contained two thermostatic switches, originally designed for the command module's 28-volt DC power, but which could fail if subjected to the 65 volts used during ground testing at KSC.Under the original 1962 specifications, the switches would be rated for 28 volts, but revised specifications issued in 1965 called for 65 volts to allow for quicker tank pressurization at KSC. Nonetheless, the switches Beech used were not rated for 65 volts.

At NAR's facility, Oxygen Tank 2 had been originally installed in an oxygen shelf placed in theApollo 10service module, SM-106, but which was removed to fix a potentialelectromagnetic interferenceproblem and another shelf substituted. During removal, the shelf was accidentally dropped at least 5 centimeters (2 in), because a retaining bolt had not been removed. The probability of damage from this was low, but it is possible that the fill line assembly was loose and made worse by the fall. After some retesting (which did not include filling the tank with liquid oxygen), in November 1968 the shelf was re-installed in SM-109, intended for Apollo 13, which was shipped to KSC in June 1969.

TheCountdown Demonstration Testtook place with SM-109 in its place near the top of the Saturn V and began on March 16, 1970. During the test, the cryogenic tanks were filled, but Oxygen Tank 2 could not be emptied through the normal drain line, and a report was written documenting the problem. After discussion among NASA and the contractors, attempts to empty the tank resumed on March 27. When it would not empty normally, the heaters in the tank were turned on to boil off the oxygen. The thermostatic switches were designed to prevent the heaters from raising the temperature higher than 27 °C (80 °F), but they failed under the 65-volt power supply applied. Temperatures on the heater tube within the tank may have reached 540 °C (1,000 °F), most likely damaging the Teflon insulation.The temperature gauge was not designed to read higher than 29 °C (85 °F), so the technician monitoring the procedure detected nothing unusual. This heating had been approved by Lovell and Mattingly of the prime crew, as well as by NASA managers and engineers.Replacement of the tank would have delayed the mission by at least a month.The tank was filled with liquid oxygen again before launch; once electric power was connected, it was in a hazardous condition.The board found that Swigert's activation of the Oxygen Tank2 fan at the request of Mission Control caused anelectric arcthat set the tank on fire.

The board conducted a test of an oxygen tank rigged with hot-wire ignitors that caused a rapid rise in temperature within the tank, after which it failed, producing telemetry similar to that seen with the Apollo 13 Oxygen Tank 2.Tests with panels similar to the one that was seen to be missing on SM Sector4 caused separation of the panel in the test apparatus.

Changes in response

Redesigned oxygen tank for Apollo14

ForApollo 14and subsequent missions, the oxygen tank was redesigned, the thermostats being upgraded to handle the proper voltage. The heaters were retained since they were necessary to maintain oxygen pressure. The stirring fans, with their unsealed motors, were removed, which meant the oxygen quantity gauge was no longer accurate. This required adding a third tank so that no tank would go below half full.The third tank was placed in Bay1 of the SM, on the side opposite the other two, and was given an isolation valve that could isolate it from the fuel cells and from the other two oxygen tanks in an emergency and allow it to feed the CM's environmental system only. The quantity probe was upgraded from aluminum to stainless steel.

All electrical wiring in Bay4 was sheathed in stainless steel. The fuel cell oxygen supply valves were redesigned to isolate the Teflon-coated wiring from the oxygen. The spacecraft and Mission Control monitoring systems were modified to give more immediate and visible warnings of anomalies.An emergency supply of 19 litres (5 US gal) of water was stored in the CM, and an emergency battery, identical to those that powered the LM's descent stage, was placed in the SM. The LM was modified to make transfer of power from the LM to the CM easier.

Aftermath

PresidentRichard Nixonawarding the Apollo 13 astronauts thePresidential Medal of Freedom

On February 5, 1971,Apollo 14's LM,Antares,landed on the Moon with astronautsAlan ShepardandEdgar Mitchellaboard, near Fra Mauro, the site Apollo 13 had been intended to explore.Haise served as CAPCOM during the descent to the Moon,and during the second EVA, during which Shepard and Mitchell explored near Cone crater.

None of the Apollo 13 astronauts flew in space again. Lovell retired from NASA and the Navy in 1973, entering the private sector.Swigert was to have flown on the 1975Apollo–Soyuz Test Project(the first joint mission with the Soviet Union) but was removed as part of the fallout from theApollo 15 postal covers incident.He took a leave of absence from NASA in 1973 and left the agency to enter politics, being elected to the House of Representatives in 1982, but died of cancer before he could be sworn in.Haise was slated to have been the commander of the canceledApollo 19mission, and flew theSpace ShuttleApproach and Landing Testsbefore retiring from NASA in 1979.

Several experiments were completed during Apollo 13, even though the mission did not land on the Moon.One involved the launch vehicle'sS-IVB(the Saturn V's third stage), which on prior missions had been sent into solar orbit once detached. The seismometer left by Apollo 12 had detected frequent impacts of small objects onto the Moon, but larger impacts would yield more information about the Moon's crust, so it was decided that, beginning with Apollo 13, the S-IVB would be crashed into the Moon.The impact occurred at 77:56:40 into the mission and produced enough energy that the gain on the seismometer, 117 kilometers (73 mi) from the impact, had to be reduced.An experiment to measure the amount of atmospheric electrical phenomena during the ascent to orbit – added after Apollo 12 was struck by lightning – returned data indicating a heightened risk during marginal weather. A series of photographs of Earth, taken to test whether cloud height could be determined fromsynchronous satellites,achieved the desired results.

As a joke, Grumman issued an invoice to North American Rockwell, prime contractor for the CSM, for "towing" the CSM most of the way to the Moon and back. Line items included 400001 miles at $1 each (plus $4 for the first mile); $536.05 for battery charging; oxygen; and four nights at $8 per night for an "additional guest in room" (Swigert). After a 20% "commercial discount", and a 2% discount for timely payment, the final total was $312,421.24. North American declined payment, noting that it had ferried three previous Grumman LMs to the Moon without compensation.

The Apollo 13 command moduleOdysseyon display at theCosmospherein Hutchinson, Kansas

The CM was disassembled for testing and parts remained in storage for years; some were used for a trainer for theSkylab Rescue Mission.That trainer was subsequently displayed at theKentucky Science Center.Max Ary of theCosmospheremade it a project to restoreOdyssey;it is on display there, inHutchinson, Kansas.

Apollo 13 was called a "successful failure" by Lovell.Mike Massimino,aSpace Shuttleastronaut, stated that Apollo 13 "showed teamwork, camaraderie and what NASA was really made of".The response to the accident has been repeatedly called "NASA's finest hour";it is still viewed that way.AuthorColin Burgesswrote, "the life-or-death flight of Apollo 13 dramatically evinced the colossal risks inherent in manned spaceflight. Then, with the crew safely back on Earth, public apathy set in once again."

William R. Compton, in his book about the Apollo Program, said of Apollo 13, "Only a heroic effort of real-time improvisation by mission operations teams saved the crew."Rick Houston andMilt Heflin,in their history of Mission Control, stated, "Apollo 13 proved mission control could bring those space voyagers back home again when their lives were on the line."Former NASA chief historianRoger D. Launiuswrote, "More than any other incident in the history of spaceflight, recovery from this accident solidified the world's belief in NASA's capabilities".Nevertheless, the accident convinced some officials, such as Manned Spaceflight Center director Gilruth, that if NASA kept sending astronauts on Apollo missions, some would inevitably be killed, and they called for as quick an end as possible to the program.Nixon's advisers recommended canceling the remaining lunar missions, saying that a disaster in space would cost him political capital.Budget cuts made such a decision easier, and during the pause after Apollo 13, two missions were canceled, meaning that the program ended withApollo 17in December 1972.

Popular culture, media and 50th anniversary

Command module replica used duringApollo 13filming

The 1974 movieHouston, We've Got a Problem,while set around the Apollo 13 incident, is a fictional drama about the crises faced by ground personnel when the emergency disrupts their work schedules and places further stress on their lives. Lovell publicly complained about the movie, saying it was "fictitious and in poor taste".

"Houston... We've Got a Problem "was the title of an episode of theBBCdocumentary seriesA Life At Stake,broadcast in March 1978. This was an accurate, if simplified, reconstruction of the events.In 1994, during the25th anniversary of Apollo 11,PBS released a 90-minute documentary titledApollo 13: To the Edge and Back.

Following the flight, the crew planned to write a book, but they all left NASA without starting it. After Lovell retired in 1991, he was approached by journalistJeffrey Klugerabout writing a non-fiction account of the mission. Swigert died in 1982 and Haise was no longer interested in such a project. The resultant book,Lost Moon: The Perilous Voyage of Apollo 13,was published in 1994.

The next year, in 1995, a film adaptation of the book,Apollo 13,was released, directed byRon Howardand starringTom Hanksas Lovell,Bill Paxtonas Haise,Kevin Baconas Swigert,Gary Siniseas Mattingly,Ed Harrisas Kranz, andKathleen Quinlanas Marilyn Lovell. James Lovell, Kranz, and other principals have stated that this film depicted the events of the mission with reasonable accuracy, given that somedramatic licensewas taken. For example, the film changes the tense of Lovell's famous follow-up to Swigert's original words from, "Houston, we've had a problem" to "Houston, we have a problem".The film also invented the phrase "Failure is not an option",uttered by Harris as Kranz in the film; the phrase became so closely associated with Kranz that he used it for the title of his 2000 autobiography.The film won two of the nine Academy Awards it was nominated for, Best Film Editing and Best Sound.

In the 1998 miniseriesFrom the Earth to the Moon,co-produced by Hanks and Howard, the mission is dramatized in the episode "We Interrupt This Program". Rather than showing the incident from the crew's perspective as in theApollo 13feature film, it is instead presented from an Earth-bound perspective of television reporters competing for coverage of the event.

In 2020, theBBC World Servicebegan airing13 Minutes to the Moon,radio programs which draw on NASA audio from the mission, as well as archival and recent interviews with participants. Episodes began airing for Season 2 starting on March 8, 2020, with episode 1, "Time bomb: Apollo 13", explaining the launch and the explosion. Episode 2 details Mission Control's denial and disbelief of the accident, with other episodes covering other aspects of the mission. The seventh and final episode was delayed due to theCOVID-19 pandemic.In "Delay to Episode 7", the BBC explained that the presenter of the series, medical doctorKevin Fong,had been called into service.

In advance of the 50th anniversary of the mission in 2020, anApollo in Real Timesite for the mission went online, allowing viewers to follow along as the mission unfolds, view photographs and video, and listen to audio of conversations between Houston and the astronauts as well as between mission controllers.Due to the COVID-19 pandemic, NASA did not hold any in-person events during April 2020 for the flight's 50th anniversary, but premiered a new documentary,Apollo 13: Home Safeon April 10, 2020.A number of events were rescheduled for later in 2020.

Gallery

• 
  Lovell practices deploying theALSEPduring training
• 
  The Apollo 13 launch vehicle being rolled out, December 1969
• 
  The "mailbox" atMission Controlduring the Apollo 13 mission
• 
  Lunar ModuleAquariusafter it was jettisoned above the Earth
• 
  Mission Control celebrates the successful splashdown
• 
  The crew on board theUSSIwo Jimafollowing splashdown
• 
  The crew speaking with President Nixon shortly after their return
• 
  Replica of thelunar plaquewith Swigert's name that was to cover the one attached toAquariuswith Mattingly's name
• 
  The crater created by the S-IVB's impact, as photographed by theLunar Reconnaissance Orbiter,2010

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External links

NASA reports

• All NASA mission transcripts
• "Apollo 13 Technical Air-to-Ground Voice Transcription"(PDF) NASA, April 1970

Multimedia

• The short filmApollo 13: "Houston, We've Got A Problem"is available for free viewing and download at theInternet Archive.