Earth's gravity is so strong we only see one side of the orbiting moon. Modern exploration to the mysterious dark side revealed dramatic surprises and revised theories about the moon's formation.
Catch new episodes of HOW THE UNIVERSE WORKS Tuesdays at 10/9c on Science! | http://science.discovery.com/tv-shows/how-the-universe-works/
Watch full episodes:
Subscribe to Science Channel:
Check out SCI2 for infinitely awesome science videos. Every day.
Download the TestTube app: