Door 11 in the 2010 advent calendar

Time to open the eleventh door in the advent calendar. Until the New Year, I’ll be opening a door onto a different landscape from somewhere in the solar system. Where in the solar system are these sinuous ridges?Click to enlarge >Eskers on Mars At full resolution the image is 60 centimeters per pixel; the view covers an area about 775 meters square. Credit: NASA / JPL / UA In geology, lots of things make ridges, but the word “sinuous” is ….


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