Alguém sabia disto?

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.


- Stewart, Iain & Lynch, John. (2007). Earth: The Biography. Washington, DC: National Geographic.