Today's Image of Mars shows an area at the base of Gale Crater's Mount Sharp where Mars Science Laboratory Curiosity will eventually explore. The darkest colored materials are deposits small grained, windblown sand. The blue areas represent unaltered igneous rock, whereas the lighter brownish-red colors are indicative of the same type of rock altered by what most scientists believe was water.
MSL Curiosity's mission is to search for signs that Mars could have once supported life as we know it; examining minerals that have been altered by the presence of water will help us to determine that. Studying the chemical composition of these rocks will provide us with unparalleled insight into the past environment on Mars.
Clicking on this image will take you to the original high resolution image. [HiRISE caption for the image]