A mysterious space rock on Earth could be the smoking gun for a long-lost planet beyond Mars

A mysterious space rock on Earth could be the smoking gun for a long-lost planet beyond Mars

Four billion years ago, Jupiter, Saturn, Uranus and Neptune battled for position within our Solar System. But some scientists suspect there was a fifth planet — similar in size to Neptune — that was also part of the battle. Now, scientists think a mysterious meteor could be evidence of that fifth Neptune-sized planet.

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