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

A massive Martian meteorite is set to be auctioned at Sotheby's in New York. The meteorite, named NWA 16788, weighs 54 pounds ...

The ratio of lead and potassium-argon isotopes in this block of mineral components including olivine, pyroxene, feldspar and glass gives it an age of roughly 4.57 billion years, which makes it ...