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A new map shows hidden Martian rivers stretching thousands of miles, offering fresh evidence of a warm, wet ancient Mars.
Why is Mars barren and uninhabitable, while life has always thrived here on our relatively similar planet Earth?
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.
Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth ...