Is there a Black Hole in our Solar System?
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See this Sixty Symbols video.

This market closes when scientific consensus has reached near certainty on this issue, either by finding a black hole, or by exploring the solar system enough that it's considered essentially impossible. Close date on this market will be extended indefinitely.

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https://www.youtube.com/watch?v=wh75ubECL8I

do man-made microscopic black holes count? e.g.

@bashmaester No

That's how the Interstellar movie began

is there a sweet spot between the mass low enough to make the hawking radiation obvious and a mass high enough to make the gravitational influence or accretion disk radiation obvious?

@JonathanRay yes, but there's no known mechanism for producing black holes of that size except perhaps primordial black holes. A 1000-ton black hole would have a lifetime close to the age of the universe. So that's a lower bound. Anything over 10^17kg would probably be detected.

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