Space/Science
http://qt.exploratorium.edu/mars/opportunity/navcam/2006-10-03/1N213144452EFF76LJP0675L0M1.JPGhttp://qt.exploratorium.edu/mars/opportunity/pancam/2006-10-04/1P213145605EFF76LJP2394R1M1.JPGTwo white parallel lines (tracks?) on the top....What's that?