Martian crater was once filled with liquid water
Ancient river deposits indicate lake lasted for millions of years
![Sandstone deposits on Mars](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/12/cc_PIA19068-1600x1200.jpg?fit=860%2C460&ssl=1)
WATERY PAST Sandstone deposits laid down by ancient rivers on Mars, seen in this image from the Curiosity rover, indicate that Gale Crater was once a shallow lake.
JPL-Caltech/NASA, MSSS