Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth.

Earth has rarely looked as remarkable as it does in this stunning shot (above) captured by NASA astronaut Don Pettit from the International Space Station (ISS).

Nestled in Michigan’s rugged Upper Peninsula, where winters are long and the people are hearty, sits a treasure trove that would make Indiana Jones rethink his career choices—the A.E. Seaman Mineral ...