NASA via Wikimedia Commons
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10. Apollo 8 Orbits The Moon
Apollo 8 became the first spacecraft to orbit the moon, which eventually led to Apollo 11 landing on the moon just a year later, and Neil Armstrong and Buzz Aldrin taking their first steps in space.

Jim Lovell, Bill Anders, and Frank Borman became the first astronauts to complete the orbit, circling the moon 10 times on Christmas Eve. During the orbit, Lovell famously said, “Houston, please be informed there is a Santa Claus.”