Space.com impacto da Lua http://www.space.com/29047-how-moon-form...heory.html said formation of the moon called Theia proposed in 2015 giant-impact hypothesis english giant-impact hypothesis Space.com Space.com Le lien is thought to have formed report report Theia Impact Hypothesis theoretical Theia impact http://www.space.com/ english 4.5 billion years ago called Theia