Anything is possible and the only way we'd ever find out is to go there and look for ourselves.
All the probes in the world won't tell you a thing...in order to really determine the veracity of anything, you need to ground truth what's apparently there. I can tell you from experience, satellite remote sensing doesn't always show you what's there, as a matter of fact it can show things that are actually not there....artifacts of the image processing, basically.
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