The largest meteorite ever found on Earth is the Goba meteorite, which weighs an astonishing 66 tons and measures about 3 meters in diameter. Discovered near the town of Grootfontein in Namibia in 1920,

A 54-pound meteorite from Mars sold for more than $5 million when it went up for auction on Wednesday at Sotheby's.

The largest Mars rock ever found on Earth, NWA 16788, just sold for $5.3 million at a Sotheby's auction to an unnamed bidder.