Mars used to be a different place.
NASA's rover recently rumbled by evidence of an ancient watery world on the red planet. A car-sized robot snapped a picture of a rock that looked like it had been stacked. The space agency wrote that the rock may have formed in a streambed or pond.
There is a place in the foothills of Mount Sharp where the streams and ponds used to be. Some of the material was deposited in piles.
A flaky, well-layered rock on Mars. Credit: NASA / JPL-Caltech / MSSS
Evidence shows that Mars was warm and moist enough to harbor large lakes.
The Peservance rover is on a journey through the planet's Jezero Crater, where NASA believes there was a lake and a river. Even though the water is gone, the robot has equipment that is meant to look for signs of life that could have been on a different Mars.
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