Apollo 13
Failed 1970 lunar mission whose free-return arc Artemis II replicates.
Last refreshed: 2 April 2026 · Appears in 1 active topic
How does Apollo 13's survival shape Artemis II's flight plan?
Latest on Apollo 13
- What is the free-return trajectory Apollo 13 used?
- A free-return trajectory is a flight path that uses lunar gravity to sling the spacecraft back to Earth without any engine burn, providing a passive abort option.Source: NASA Apollo 13 mission report
- How far did Apollo 13 travel from Earth?
- The crew reached 248,655 miles (400,171 km) — the current human distance record from Earth.Source: NASA Apollo 13 mission records
- Will Artemis II break Apollo 13's distance record?
- Yes. Artemis II is expected to surpass 248,655 miles once Orion completes its lunar flyby.Source: NASA Artemis II mission profile
- What went wrong on Apollo 13?
- An oxygen tank exploded on day two, disabling the Command Module. The crew used the Lunar Module as a lifeboat and returned safely on a free-return arc.Source: NASA Apollo 13 mission report
- Why does Artemis II use the same route as Apollo 13?
- The free-return trajectory is a proven safety mechanism. Apollo 13 demonstrated it could bring a crippled spacecraft home without engine power.Source: NASA Artemis II mission overview
Background
Artemis II uses the same free-return trajectory concept that saved Apollo 13's crew after an oxygen tank explosion aborted the Moon landing in April 1970. The trajectory commits the spacecraft to a gravity-assisted arc that returns it to Earth without a powered burn if systems fail.
Apollo 13 launched on 11 April 1970 with Commander Jim Lovell, Command Module Pilot Jack Swigert, and Lunar Module Pilot Fred Haise. Two days into the mission an oxygen tank exploded, forcing the crew to shelter in the Lunar Module as a lifeboat. They swung around the Moon, reaching a record 248,655 miles (400,171 km) from Earth — the greatest distance any human has travelled from Earth.
Apollo 13's survival validated the free-return trajectory as the primary safety mechanism for lunar missions. Artemis II's trans-lunar injection burn commits to the same type of arc; the mission will break Apollo 13's distance record once Orion passes that mark, closing a 54-year chapter in human spaceflight history.