This is the title CNN gave to this photo that was cataloged as part of the "strange and interesting" section of their science website recently.
Avi Blizovsky
A formation reminiscent of an impact crater on one of the solar system's nitrogenous moons is actually a landmark on our planet.
This snail shape is actually a hill about 50 kilometers wide in Mauritania in the Sahara desert. It is easily visible from any satellite and the Holiday Space Shuttle in orbit around the Earth.
This image was taken by the Landsat 7 imaging satellite. Geologists are not sure what caused the formation of the snail hill but have for now ruled out the possibility that it was a meteor strike or a volcanic eruption.
