In those drill sites, Curiosity detected deposits containing an iron carbonate material called siderite. According to Ben Tutolo, a University of Calgary associate professor of Earth, Energy, and Environment Studies as well as a NASA Mars Science Laboratory Curiosity Rover team, the data marks a major moment in the search for extraterrestrial life.

In a major development that could reshape our understanding of Mars’ history, NASA’s Curiosity rover has uncovered new evidence that may explain the fate of the Red Planet’s once-thick atmosphere and its ancient watery environment.

Could Mars have really been home to alien lifeforms? NASA's most recent discovery, made by its Curiosity Rover on the Red Planet, has unveiled data which brings scientists one step closer to knowing