An examination of rocks collected by Apollo astronauts shows a peculiar type of oxygen indicating a massive collision between Earth and another object 4.5 billion years ago that formed the moon.
Source: http://www.npr.org/blogs/thetwo-way/2014/06/06/319540935/new-look-at-apollo-rocks-finds-evidence-of-moons-birth?ft=1&f=1007
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