As civilizations become more and more advanced, their power needs also increase. It's likely that an advanced civilization ...

According to this story, when the solar system was just getting started, a Mars-size protoplanet named Theia slammed into the proto-Earth ... the moon into a molten ball, more than enough to ...

According to a new theory, there were two giant impacts in a row, separated by about one million years, involving a Mars-sized 'Theia' and proto-Earth. In this image, the proposed hit-and-run ...