Large oceans of water and a rich atmosphere with just the right elements to support life set Earth apart from its close cousins in the solar system. Earth is also the only planet that has an active ...

A new study suggests that plate tectonics -- the dynamic processes that formed Earth's mountains, volcanoes and continents -- began about 3 billion years ago. By analyzing trace element ratios that ...

Planet Earth is situated in what astronomers call the Goldilocks Zone -- a sweet spot in a solar system where a planet's surface temperature is neither too hot nor too cold. An ideal distance from a ...