As the sun grew hotter, so did Mars, prompting much of its atmospheric carbon dioxide to rain out and ultimately get locked up in rocks.

Paris: Why is Mars barren and uninhabitable, while life has always thrived here on our relatively similar planet Earth? A ...

One of the great unsolved problems in modern planetary science is written on the surface of Mars. Mars has canyons that were ...

NASA's Perseverance rover is digging deeper into Mars' geologic past as it begins grinding into rock surfaces to expose ...

A hidden box-lattice suggests groundwater sculpted Mars long after surface water fled; Curiosity’s drills aim to confirm the ...