NASA's Curiosity Rover Reveals Clues About the Red Planet's Wet Past

Although NASA's Curiosity rover is getting ready to celebrate its 10th year on Mars, the machine shows no signs of slowing down. These past months, the rover has been climbing Mount Sharp, going from a clay-rich area to one filled with a salt mineral called sulfate. Exploring this transition zone can help scientists understand more about the Red Planet's watery past. (continue reading...)