Can radio waves image subsurface layers of planets?

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Noduagga
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...and they can penetrate a bit in the surface, we could image the subsurface right? I do not see the problem...
Help please!
 
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If they have already reflected off the surface, they aren't around any more to be reflected by something beneath the surface.
 
Subsurface imaging of the moon has been done rather extensively.
 
Imaging with a satellite would be relatively easy but there must be enormous problems using Earth based observation.