Could be a comet .. there are so many things happening out there. Was watching a doco last night on Saturn (for the umpteenth time) and I'm reminded of how much H2O is being poured into the outer regions (& rings) by Enceladus' cryovolcanism. There's heaps of ice out there, probably coming from Enceladus !!
Would be great to find out someday .. not in our lifetimes, I suspect.
Cheers
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