A 54-pound Martian rock, known as NWA 16788, fetched a record $5.3 million at Sotheby’s, becoming the most expensive meteorite ever sold at auction.

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

A massive Martian meteorite, NWA 16788, was auctioned in New York. The meteorite fetched a record $5.3 million. The buyer remains unknown. This is the largest Martian rock ever found on Earth. It weighs 54 pounds.