Watch your back, Martians, the next Mars rover will be packing heat. Set to launch in 2009, the NASA/Jet Propulsion Laboratory Mars Science Laboratory rover will carry a laser tool for zapping rocks and analyzing their debris composition. The ChemCam mast unit will fire seven-nanosecond laser pulses through a small focusing telescope to vaporize chunks from target rocks up to 30 feet away, according to a NASA statement.