The car-sized Curiosity rover has spotted evidence of once quite hospitable environs on Mars.

But there is good news coming from the small Mars rover Curiosity. A new study using imagery from the rover shows evidence that the red planet once may have been pretty hospitable, even habitable. The study by scientists at Caltech discusses the discovery of ancient wave ripples on the Mars surface,

NASA has found signs of a lake on Mars, with evidence suggesting the presence of water rather than just ice. Researchers discovered ripples in the sandy shores of ancient lakebeds on Mars, which were likely created by the movement of water pushed by wind.