The bright rocks in this picture of the Mars surface (taken by the Mars Reconnaissance Orbiter) are believed by scientists to contain minerals that have water. Data from MRO’s scientific instrument known as the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) along with high-resolution images supplied by the HiRiSE platform were used to make this (still speculative) determination. This should help scientists further postulate and study the state of Mars’ past climate and geography.