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A comment on What if Planet 9 is a Primordial Black Hole? (2019). Parent comment

Re:What if Planet 9 is a Primordial Black Hole? (2019) by DrBazza on Friday August 13, 2021 @09:16AM (#28168449)
You could drop matter in there and get 40% of the mass back as energy. Not that it's useful energy for us at the moment, but a more advanced civilization could probably learn how to ensure most comes out as polar jets and harvest that somehow.

https://web.stanford.edu/~wilkinsd/docs/posters/BlackHolesPo...

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Re:What if Planet 9 is a Primordial Black Hole? (2019) by mrfusion on Friday August 13, 2021 @09:42AM (#28168709)
Easier to build a Dyson sphere around it than the sun.
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by wongarsu on Friday August 13, 2021 @10:19AM (#28169160)
A Dyson sphere around a body with 4.5cm radius sounds quite manageable. I wonder how small a Dyson sphere could be with current materials. I imagine it's mostly limited by gravitational forces at that point?
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by dnautics on Friday August 13, 2021 @01:53PM (#28172136)
or some sort of roman war bird.
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by jsjohnst on Friday August 13, 2021 @06:47PM (#28175754)
> roman war bird

Roman? Did you maybe mean Romulan?

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Re:What if Planet 9 is a Primordial Black Hole? (2019) by adrusi on Friday August 13, 2021 @01:44PM (#28172045)
I think you can also extract energy from it by slingshoting an object off the black hole to draw energy from the black hole's spin.
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by p1mrx on Friday August 13, 2021 @05:49PM (#28174988)
Would it be useful to have a large power plant at the edge of the solar system? There's not much out there to power.
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by DrBazza on Saturday August 14, 2021 @02:38AM (#28178586)
Microwave transmission could send it somewhere else... wirelessly: https://en.wikipedia.org/wiki/Wireless_power_transfer#Microw...
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by darepublic on Friday August 13, 2021 @09:40AM (#28168696)
You could use it to execute prisoners perhaps. Death by blackhole
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by teknopaul on Friday August 13, 2021 @10:41AM (#28169481)
The CO2 cost of getting the prisoners from the prison outside earth's gravity well and on their way to planet 9 seems prohibitive.

One more reason for rehabilitation as prison policy.

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Re:What if Planet 9 is a Primordial Black Hole? (2019) by darepublic on Friday August 13, 2021 @07:07PM (#28175947)
you'd have to space bus the prisoners, a few hundred thousand at a time. during the journey they might mutiny, take over the ship and set a course for a nearby livable planet.
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