Curiosity's Chemical and Camera instrument, or ChemCam, fires a laser pulses that last just five one-billionths of a second but deliver more than a million watts of power, enough to turn solid rock into an ionized plasma. A trio of spectrometers in the tool then studies the sparks from the laser fire on 6,144 different wavelengths of ultraviolet, visible and infrared light to determine the composition of the vaporized rock.
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<br />http://www.csmonitor.com/Science/2012/0820/Curiosity-rover-begins-vaporizing-Mars-one-rock-at-a-time
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