TRIVIA: According to a hypothesis by astronomers, Earth was originally born as a twin to the planet Theia, which was about half as wide as Earth and roughly the size of Mars. The two planets shared an orbit for several million years until they collided. Earth absorbed Theia, and the remaining debris eventually coagulated into Earth’s moon. The mass donated by Theia gave Earth the gravity necessary to sustain a substantial atmosphere.
Posted on: Sun, 02 Feb 2014 09:50:47 +0000
Trending Topics
Recently Viewed Topics
© 2015