For the first time, scientists have caught a key driver of the ongoing erosion of the atmosphere of Mars in action.It took more than nine years' worth of satellite data, but a team led by planetary scientist Shannon Curry of the University of Colorado Boulder has finally detected unmistakable signs of atmospheric sputtering. This is, the researchers say, a crucial piece of the puzzle of how Mars lost both its atmosphere and its water. "These results provide a substantial step toward observation...