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

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,