The Moon

S1 E5: It's so close...yet so far away. For thousands of years, mankind has found comfort in its presence. It's been a lantern for nighttime travelers...a timekeeper for farmers...and a location finder for sailors at sea. For some cultures, it's even been a god. It's the only cosmic body ever visited by human beings. And, today, NASA is planning a permanent outpost there. But how did it get there in the first place? How did the Moon come to be? The answer is more astounding and spectacular than most residents of earth have ever imagined.