An artist's impression of the collision between the early Earth and Theia, which may have formed the moon MPS / Mark A. Garlick Around 4.5 billion years ago, a planet called Theia is thought to have ...
Nearly 4.5 million years ago, two large, hot stars brushed tantalizingly close to Earth's sun. They left behind a trace in the clouds of gas and dust that swirl just beyond our solar system—almost ...
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