Mystery white rock inexplicably appears near NASA Mars rover
By Irene Klotz, Reuters
CAPE CANAVERAL, Fla. - Scientists are stumped as to how a rock mysteriously appeared in images taken two weeks apart by NASA's Mars rover Opportunity.
The rover, which landed in an area known as Meridiani Planum a decade ago, is exploring the rim of a crater for signs of past water.
Another rover, Curiosity, touched down on the opposite side of the planet in 2012 for a more ambitious mission to look for past habitable environments.
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