Mars is cold and dry, but billions of years ago, it was cold and wet. That's according to new evidence from NASA's Curiosity rover.
A new study suggests ancient Mars harbored long-lasting lakes, boosting the odds that life could have existed on the Red Planet billions of years ago. NASA scientists say the study is based on new data from NASA’s Curiosity rover, which was sent to the Red Planet 3 years ago. This is the second big water announcement NASA has made about Mars recently. Last week, the space agency revealed evidence that salty, liquid water still flowed in small amounts on the surface.