If it's artificial we should consider a staggering variety of possibilities including ice rockets. But I've thought of a natural explanation: a comet-like object that experienced a natural high-energy event of duration less than its rotation time, giving it an asymmetric albedo.https://twitter.com/mccrmx/status/1065445820059738112 …
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The causation could be indirect: chemical changes caused by the high-energy event might make one side of the object more immune to dust being blown off or ice deposited than the other side, so when we observed it one side or part was exposed ice and other(s) dark soot.
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From original paper: "A roughly spherical object with a hemispheric albedo variation of a factor of 10 could also reproduce the lightcurve [instead of 10:1 oblong shape]" Per above theory ‘Oumuamua has an unusual albedo variation not an unusual shape. https://www.eso.org/public/archives/releases/sciencepapers/eso1737/eso1737a.pdf …
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End of conversation
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Your mind. Is one of a kind. ancient. high-energy radiating event.
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Hope you're right, my Thanksgiving statement was am glad there's no dark forest issues yet as no random starship sighted
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