Perfect circle!!

• by billinb3

  What causes a perfect circular shadow/feature as in the top right hand corner

  Posted January 9, 2013 10:29 PM

• by theclearskiesofthemoon

  I don't see a perfect circle. Those black things are the blotches you are looking for.

  Posted January 9, 2013 10:31 PM

• by billinb3

  In the top right there is a black circle with a round object possibly casting the shadow - i had to enlarge to 400% to see it.

  Posted January 9, 2013 10:34 PM

• by theclearskiesofthemoon

  It's either a crater or a boulder, not 400% sure.

  Posted January 9, 2013 10:37 PM

• by Portyankina scientist

  A boulder, some examples here http://blog.planetfour.org/

  Anya

  Posted January 9, 2013 10:54 PM