Analyzing Martian Rocks Analyzing Martian Rocks Audio will be available later today. Facebook Twitter Google+ Email July 29, 199712:00 AM ET Heard on Morning Edition — Host Joe Palca talks with Professor Peter Smith of the University of Arizona about the spectrum of colors found among Martian rocks. Erosion and weathering have left the surface of the Pathfinder landing area red, white, and blue. Facebook Twitter Google+ Email We no longer support commenting on NPR.org stories, but you can find us every day on Facebook, Twitter, email, and many other platforms. Learn more or contact us.