Stunning Mars photos by Curiosity rover show climate shift

A venerable Red-Planet rover might be spotting signs of the Martian climate drying up in ancient times.

The long-running NASA Curiosity mission, which will reach its 10th Earth-year anniversary on the Red Planet this August, is making its way up the slopes of Mount Sharp (Aeolis Mons) to trace the changing climate of Mars over the eons. For about the past year of its roving, Curiosity has been noticing water-rich clay giving way to a transition zone filled with salty sulfate. Scientists currently believe those features mark where streams dried up and sand dunes formed, according to a NASA statement (opens in new tab).

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