A recent study suggests a that a primordial black hole may be orbiting the sun at and that they can be common near other star systems.

What measurements and equipment can perhaps find BH's near other stars?

  • $\begingroup$ If they are of at least planetary mass, you should be able to detect wiggles in the star's position as the hole orbits. It'll have to be close in. Eclipse dimming seems a forlorn hope fir such holes. They are small. $\endgroup$ – Wayfaring Stranger Oct 27 '19 at 17:27
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    $\begingroup$ Main problem would be the same as with any kind of dark matter: how could they get rid of potential energy and angular momentum so that they'd end up orbiting the star? Most likely when they encounter a star they'd fall down the gravity well and gain velocity, but then climb up from the well using the said velocity. $\endgroup$ – tuomas Oct 27 '19 at 20:26
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    $\begingroup$ While I'm sure a recent study says that; is it possible cite or link to it? Thanks! $\endgroup$ – uhoh Oct 27 '19 at 23:05
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    $\begingroup$ Depending on the system, radial velocity, astrometric reflex motion of the host star or gravitational microlensing could detect them. The tricky part is being able to distinguish between a primordial black hole and a planet. $\endgroup$ – antispinwards Oct 28 '19 at 19:46

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