image: Sander crater, 47 km in diameter. A high density of hollows occurs in the high-reflectance portions of the crater floor; others are found on the northern crater rim and wall terraces. Stereo analysis indicates that any elevation differences between the high-reflectance and darker areas of the floor are approximately 20 m. Image EN0218289182M, 30 m/pixel. This image relates to an article that appeared in the Sept. 30, 2011, issue of Science, published by AAAS. The study, by Dr. D.T. Blewett of Johns Hopkins University Applied Physics Laboratory in Laurel, Md., and colleagues was titled, "Hollows on Mercury: MESSENGER Evidence for Geologically Recent Volatile-Related Activity." view more
Credit: Image courtesy of <i>Science</i>/AAAS