The Curiosity rover identified hidden caches of the mineral siderite, which could help explain why Mars lost its habitable climate.

NASA’s Curiosity rover has drilled the Mars’ subsurface in three to four centimeters to extract the findings. Explore details of the mission.

According to Don Pettit, who lived on the International Space Station in 2003, part of the problem is the terrestrial habit of looking for lost items down at your feet. “In weightlessness ...