With Friday's launch, NASA's Mars Reconnaissance Orbiter is now on its way to the Red Planet. One of the instruments on board is CRISM, or the Compact Reconnaissance Imaging Spectrometer for Mars. This instrument will search for evidence of past water on the surface of the planet, by locating the residues left by minerals that formed in water. It'll have 20 times the resolution of any previous instrument sent to Mars to do this task. With data gathered by CRISM, researchers should have a wealth of potential targets for future rovers and landers.