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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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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Or else it’s just the alien grown-ups thankfully coming to take Musk home again...
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