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M0701799c
Look at the squared and regular inner surfaces of this "crater."  What "geological" process could have formed this?

click to see the image analized
Because of possible optical illusions, you should see this image reversed; take a look a the processed image to the left. It shows the real 3D placement of this object.

The original image is NASA m0701799c


click to see the image analized
Because of optical illusion you could see this image reversed; take a look a the processed image aside. It shows the real 3D placement of this object.

Original image is NASA m0701799c