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Barry Petchesky

Illustration of the giant impact hypothesis, with the hypothetical planet Theia colliding with Earth 4.5 billion years ago, created on July 19, 2015. This impact is suggested to be the source of material that created the Moon. (Illustration by Tobias Roetsch/Future Publishing via Getty Images)

Science

Curious Earth Lumps Might Be Leftovers From Another Planet It Ate

theia