Curiosity rover finds water-carved 'book' rock on Mars (photo)

A book-shaped rock on Mars was likely carved by ancient water running through the area, scientists on NASA's Curiosity rover mission say.

Curiosity rover finds water-carved 'book' rock on Mars (photo)
A book-shaped rock on Mars was likely carved by ancient water running through the area, scientists on NASA's Curiosity rover mission say.

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