Cosmos: A SpaceTime Odyssey: Season 2, Episode 8

2 - 8: The Sacrifice of Cassini

A mysterious untold story is brought to life: a scientist figures out how to go to the Moon while fighting for his life in a World War I trench. He wrote a letter addressed to readers 50 years in the future, making the Apollo Mission possible. Witness the 20-year-long odyssey of a robotic explorer ordered to self-destruct on another world.