A treasure trove of clues from Curiosity reveals that ancient Mars once trapped massive amounts of CO2 in its crust, thanks to surprising concentrations of iron carbonate deep in Gale Crater. By drilling into layers laid down in a vanished lake,

A photomosaic taken by the Curiosity rover on April 30, 2023, at one drill site in Gale Crater, Mars. Rock powder samples drilled here contained substantial amounts of the iron carbonate mineral siderite.

The lead author of a new study pointing to more proof of water on Mars says it brings scientists a step closer to determining whether the planet was ever capable of supporting life.