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The fact that the largest high-reflectivity feature is right in the centre of a whopping great crater suggests to me that what we see are the remnants of an incoming icy body (comet?), breaking up because of gravitational tidal forces, then impacting (hence the adjacent reflective blobs).
Either that or a significant impact has exposed or excavated pre-existing icy sub-surface material.
But then, I'm only a biologist...!
Dean
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