If planet 9 is not a planet but a black hole how can we find it? Can we see gravitational lense or infrared/gamma light?
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$\begingroup$ I'd presume that microlensing events, if you looked in the right place at the right time, would be possible. $\endgroup$– WarpPrimeJan 13, 2022 at 14:52
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1$\begingroup$ And for a sense of scale, we'd be talking about a BH roughly the size of a softball or large orange. $\endgroup$– epsJan 13, 2022 at 15:02
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$\begingroup$ Its impossible to any blackhole if it is "silent". Although its still a tough job to detect supermassive blackholes, In your case difficulty of detecting a black hole of radius just 4.4 cm with an optical ground telescope depends on how far it is away from the sun. Gravitational lensing will help $\endgroup$– Kavin IshwaranJan 13, 2022 at 15:04
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$\begingroup$ Does this answer your question? How would a small nearby black hole be detected and confirmed as such? See also: astronomy.stackexchange.com/questions/27983/… and astronomy.stackexchange.com/a/36882/2531 $\endgroup$– ProfRobJan 13, 2022 at 15:25
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