Dreikanter is a german word meaning three sides. It is used to call naturally occuring pyramids found in Antartica but also on Mars. These pyramids, as Carl Sagan explains so expertly, are "generated by wind erosion - the splatter of fine particles picked up by strong winds blowing in the same direction and, over the years, sculpting what once were irregular hummocks into nicely symmetrical pyramids."
This picture of Mars' surface led many people to believe in the presence of life on Mars. Scientists now explain these rock formations through wind erosion. [Picture Credits Erol Torun]