A close-up of the rectangular rock called "Flat Top" from NASA's Mars Pathfinder (MPF) rover Sojourner in July, 1997. http://photojournal.jpl.nasa.gov/catalog/PIA00626
Flat Top
A close-up of the rectangular rock called "Flat Top" from NASA's Mars Pathfinder (MPF) rover Sojourner in July, 1997. http://photojournal.jpl.nasa.gov/catalog/PIA00626