「月の神秘 知られざる４５億年の隣人」
Do We Really Need the Moon? - BBC Documentary 2011
Do We Really Need the Moon? - BBC Documentary 2011 [HD]
BBC Two - Do We Really Need the Moon? - Clips
Giant impact hypothesis - Princeton University
Two Moons Theory
Earth May Have Had Two Moons : Discovery News : Discovery News
Earth used to have TWO moons... but one was destroyed in a giant collision
Do We Really Need the Moon? - BBC Documentary 2011
Do We Really Need the Moon? - BBC Documentary 2011 [HD]
BBC Two - Do We Really Need the Moon? - Clips
Giant impact hypothesis - Princeton University
Two Moons Theory
Earth May Have Had Two Moons : Discovery News : Discovery News
Earth used to have TWO moons... but one was destroyed in a giant collision
