Theia - the Lost Planet

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Actually, this is not science fiction. There is a theory that the planet Theia existed 4.5billion years ago. It is thought to have been the size of Mars. The idea goes that it collided into Earth, and it was that collision which created the Moon.

Thing is, no one has any hard evidence of this, yet. NASAs STEREO spacecraft will be hitting the L4 and L5 Lagrange points soon, and there is a chance that they will find evidence of this long lost planet.

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