Decades-old found footage from NASA's abandoned Apollo 18 mission, where three American astronauts were sent on a secret expedition, reveals the reason the U.S. has never returned to the moo... Read allDecades-old found footage from NASA's abandoned Apollo 18 mission, where three American astronauts were sent on a secret expedition, reveals the reason the U.S. has never returned to the moon.Decades-old found footage from NASA's abandoned Apollo 18 mission, where three American astronauts were sent on a secret expedition, reveals the reason the U.S. has never returned to the moon.