NASA's Curiosity rover has encountered an extraordinary landscape while climbing through a Martian valley nicknamed "Valle Grande." Images sent back by the rover show the ground covered with honeycomb-like patterns known as polygonal fractures, each measuring about 1.5 to 3 inches (4 to 8 centimeters) across.
Curiosity has seen small clusters of similar geometric shapes before, but never anything approaching the scale of the field now visible in Valle Grande.<...

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