It isn’t easy to figure out how the Earth was built, because it happened 4½ billion years ago, and no one was there to watch. So scientists have had to look at what the Earth looks like now and at all ...

NASA-supported scientists have provided new information about how the early Earth may have acquired some elements necessary for the planet to become habitable. They also suggest a new role for Jupiter ...

Add Yahoo as a preferred source to see more of our stories on Google. The Earth formed in a ring of debris around the Sun, like the one around Vega, a bright star, in this artist's conception.