For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the largest piece of Mars ever found on Earth.

For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the largest piece of Mars ever found on Earth.

A Martian meteorite said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York.

The biggest piece of Mars on Earth is going up for auction in New York The red, brown and gray hunk is about 70% larger than the next largest piece of Mars found on Earth and represents nearly 7% ...

Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth. The natural history-themed sale on Wednesday features a ...

The red, brown and gray hunk is about 70% larger than the next largest piece of Mars found on Earth and represents nearly 7% of all the Martian material currently on this planet, Sotheby’s says.