Massive dome or sphere inside Martian Crater

This image was taken by NASA’s Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) on 2008-07-06T17:59:30.940.

NASA describes this image as “Terrain north of Mawrth Vallis.”

Case #23: Massive dome or sphere inside Martian Crater:

I discovered what appears to be a massive dome or spherical object or structure with an estimated diameter of 450 metres inside a crater on Mars.

Massive dome or sphere inside Martian Crater
Massive dome or sphere inside Martian Crater
Massive dome or sphere inside Martian Crater (zoomed view)
Massive dome or sphere inside Martian Crater (zoomed view)

Unlike a similar, smaller dome or sphere I found this one does not appear to be self-illuminating, however it does seem to be covered in Martian dust so it’s difficult to say for certain.

Original NASA source: http://viewer.mars.asu.edu/planetview/inst/ctx/P21_009115_2081_XN_28N019W

I used NASA’s image viewer to the left of the NASA web page to view this anomaly.

Is this a natural, round bulge in the centre of the crater or a structure, perhaps another dome base station?

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