Moon rock

Moon rock

. Harrison Schmitt about to walk behind Split Rock during the Apollo 17 mission in December 1972. Eugene Cernan had already scooped up samples from the debris on the front side of the boulder. The huge rock rolled down about a billion years ago, splitting into five pieces during the fall. The total length of the boulder, when reassembled is about 20 meters. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University