Lily Newman - Opportunity, aka The Little Rover That Could, is still making important discoveries 10 years into its Martian jaunt. After the devastating loss of twin rover Spirit in 2011, Opportunity rallied and kept trekking, only to recently discover a fascinating rock near Endurance Crater. One of the oldest rocks ever analysed, the specimen shows that drinkable water once existed on Mars. Opportunity identified a type of clay mineral on the rock that is only formed in neutral water, like the water found on Earth. Steve Squyres, the principle...
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