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A Dyson sphere around a black hole

(arxiv.org)
214 points SkyMarshal | 1 comments | 19 Aug 21 03:40 UTC | HN request time: 0.297s | source
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foxes ◴[19 Aug 21 07:25 UTC] No.28231293[source]▶
Taking this one step further, you could build an immensely powerful bomb/superweapon/mega space engine. Cover the inside of the Dyson spheres with mirrors then fire a laser inside. The black hole provides the perfect source to ramp up the energy before you could unleash it in a (un)directed way.
replies(1): >>28231538 #
adrianN ◴[19 Aug 21 08:14 UTC] No.28231538[source]▶
It's pretty hard to make mirrors that work at very high energy densities. We don't know how to make gamma ray mirrors for example, and even for longer wavelengths we don't have perfect mirrors.
replies(1): >>28231758 #
snet0 ◴[19 Aug 21 09:02 UTC] No.28231758[source]▶
Harder than making a Dyson sphere around a black hole?
replies(2): >>28231818 #>>28231830 #
1. adrianN ◴[19 Aug 21 09:14 UTC] No.28231818[source]▶
Depending on the size of the black hole, yes.