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

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The meteorite is believed to have been blown off the surface of Mars by a massive asteroid strike before travelling 140 million miles to Earth, where it crashed into the Sahara.

For sale: A 25 kilogram rock. Estimated auction price: $3-$6 million. Why so expensive? It's the largest piece of Mars ever ...