"This is the largest piece of Mars on planet Earth. The odds of this getting from there to here are astronomically small," Cassandra Hatton, vice chairman of science and natural history at Sotheby's,...

The largest piece of Mars ever found on Earth was sold for just over $5 million at an auction of rare geological and archaeological objects in New York on Wednesday.

"This is an amazing Martian meteorite that broke off of the Martian surface," said Cassandra Hatton, Sotheby's vice-chairman and global head of science and natural history, ahead of the auction.