Nili Patera, one of the most active dune fields on the planet Mars is shown in this handout photo taken by NASA’s Mars Reconnaissance Orbiter March 1, 2014 and provide by NASA May 2, 2014. By monitoring the sand dune changes, NASA can determine how winds vary seasonally and year-to-year. REUTERS/NASA/JPL-Caltech/Univ. of Arizona/Handout via Reuters (OUTERSPACE – Tags: SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) ATTENTION EDITORS – THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY AU NTICITY, CONTENT, LOCATION OR DATE THIS IMAGE. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS – RTR3NKAK