Season 1 Episodes6
Cast2

Gary Sinise
Self - Narrator
E
Eugene Cernan
Self
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Ranked #4 of 6 in Season 1•−0.1 vs season avg
Apollo 13 puts the astronauts to the ultimate test, returning a damaged spacecraft back safely to earth. Apollo 17 sends man for the longest mission yet to the surface of the moon, but it's the last lunar mission for generations. Now, it's time for a

Gary Sinise
Self - Narrator
Eugene Cernan
Self
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"The Explorers" is episode 4 of When We Left Earth: The NASA Missions season 1. It scored 8.2/10 from 68 votes, ranking #4 of 6 episodes this season (season average 8.3). It aired on June 15, 2008.