NASA picks Lockheed Martin to build a rocket that will return from Mars

The Perseverance rover is a capable machine, but one thing it can't do is send rock, sediment and atmospheric samples from Mars back to Earth by itself. NASA hopes to retrieve some of those through its Mars Sample Return Program, and it's taken another step forward in the project. The agency has chosen Lockheed Martin to build the first rocket to be fired off another planet. The Mars Ascent Vehicle (MAV) will be a small, lightweight rocket and is a crucial component of NASA's ambitious plan. "Th...