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posted on 08 May 2015

Infographic Of The Day: How Apollo 13's Dangerous Survival Mission Worked

On April 11, 1970, NASA launched the Apollo 13 mission to send three astronauts to the moon and mark the third manned lunar landing.

The mission aimed to send commander Jim Lovell and lunar module pilot Fred Haise to the lunar surface, while command module pilot Jack Swigert remained in orbit. But on April 13, the mission suffered a crippling explosion that would nearly doom the spaceflight and its crew.

Apollo 13's crew trained for making the first landing in the Fra Mauro lunar highlands, which appear brighter than the flat plains, or "maria," where the earlier two Apollo missions landed.

But Apollo 13 carried an oxygen tank with a troubled history. The tank had been damaged in testing, but the spacecraft builders were not aware of a problem. The cylindrical service module had six pie-slice sectors. Sectors 2, 3, 5 and 6 held the main fuel tanks. Sector 4 held the damaged oxygen tank.

At about 56 hours into the flight of Apollo 13, Jack Swigert was instructed to "stir the tanks," or agitate the super-cold liquid oxygen. Moments later, oxygen tank 2 exploded. Photos taken near the end of the flight reveal the extent of the damage. "One whole side of the spacecraft is missing!" exclaimed Lovell.

With the command module losing power fast, the astronauts had to move into the lunar module, or LM, to use it as a lifeboat. Designed for two, the LM's cabin was a tight fit for three people, with Swigert keeping mostly to the small section at the rear of the cabin.

The LM did not have enough carbon-dioxide-scrubbing chemical canisters to keep the air breathable for three men all the way back to Earth. The astronauts had to build a crude adapter using spare parts on board, to make use of canisters meant for the command module.

At the time of the accident, Apollo 13 was on a path that would cause it to miss Earth by 2,500 miles (4,023 kilometers). To return home the astronauts had to fire the lunar module’s big landing engine several times to get back on the right trajectory.

[click here to enlarge infographic]

Key facts about the Apollo 13 moon mission.
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