A smaller planet, Theia, slammed into an early Earth so hard that the planets effectively mixed together. Moon was formed by debris from a violent head-on collision between Earth and Theia. The ...

If the story of Earth were a book, its first 500 million years would be missing pages — or at best, smudged and torn ones. Yet, according to a group of cosmochemists and geologists, a few faint ...

The Moon likely formed from a giant impact with a sister planet, influencing Earth’s seasons and habitability. With the penny going away, what should you do with the ones in your coin jar? FBI ...