Is it possible that shadow people, spirits, poltergeists, and other enigmatic entities are rooted in reality? See more in this scene from Season 2, Episode 12, "Aliens and the Unseen." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows ...

Scientists cannot say with absolute certainty where the moon came from. See more in this scene from Season 1, Episode 6, "Mysteries of the Outer Realms." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...