Recent data from NASA's Mars Reconnaissance Orbiter suggests there could have been water on Mars as recently as 2 billion years ago.
One of the biggest topics in Mars research right now is understanding the history of water on the planet. Scientists know that there was once abundant liquid water on its surface, though now all that water has disappeared and the planet is arid. The only remaining water on Mars’s surface today is in the form of water ice near its poles or in deep canyons.
The researchers used data from the MRO to look at salt deposits that were left behind when water evaporated. They looked for these deposits in areas with impact craters caused by asteroid impacts, which can be used for dating as more craters generally mean older terrain. By combining information about the number of craters and the extent of salt deposits, they could estimate the date of water evaporation.
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