little-known fact

It's a little-known fact that there are actually three celestial bodies in our little patch of the Solar System – the Earth, the Moon, and Theia. Today, the latter is little more than a ghost, after smashing into our planet 4.5 billion years ago. For decades, it was thought that when this small Mars-sized planet collided with the infant Earth, the resulting debris – mostly from the other planet itself – coalesced to form the Moon.

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