The largest fragment of Mars ever discovered on Earth, a 54-pound meteorite named NWA 16788, is set for auction at Sotheby's in New York.

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

The world’s largest Martian meteorite, weighing 54 pounds, will be auctioned by Sotheby’s in New York. The rare rock, ...