Boulders?
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by
genevieveho
Hi, are these round circular marks boulders? I infer so from the fans at some of them.
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by
Kitharode
moderator
Hi There. These are actually depressions in the surface. In these images the sunlight comes in from the bottom right, so the left side of each depression (upslope) catches the sun, with the right hand side (downslope) in shadow. The same thing occurs with spider channels which often look like ridges but are in fact depressions.
It often helps if you tilt your screen to change the contrast, or turn the image upside down. Relax your eyes. 😉 Great image...
Posted