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A Dyson sphere around a black hole

(arxiv.org)
214 points SkyMarshal | 7 comments | 19 Aug 21 03:40 UTC | HN request time: 0s | source | bottom
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saagarjha ◴[19 Aug 21 05:02 UTC] No.28230503[source]▶
Better link: https://arxiv.org/abs/2106.15181

The results are fairly obvious: CMB and Hawking radiation provide almost zero power output, while an accretion disk and relativistic jets can provide a lot of power.

replies(2): >>28230601 #>>28231063 #
1. brador ◴[19 Aug 21 06:42 UTC] No.28231063[source]▶
How would you tap an accretion disk? How would you tap relativistic jets?
replies(3): >>28231072 #>>28231403 #>>28231426 #
2. devoutsalsa ◴[19 Aug 21 06:43 UTC] No.28231072[source]▶
Solar panels?
replies(1): >>28231395 #
3. andai ◴[19 Aug 21 07:44 UTC] No.28231395[source]▶
How about a big ol' waterwheel?
4. Qub3d ◴[19 Aug 21 07:46 UTC] No.28231403[source]▶
Kurtzgesagt made a video explaining some possibilities. In short, you can throw mass or radiation at a spinning black hole and "steal" rotational energy from it.

https://www.youtube.com/watch?v=ulCdoCfw-bY

replies(1): >>28231512 #
5. tanbog4 ◴[19 Aug 21 07:50 UTC] No.28231426[source]▶
Heat water to produce steam, use steam to turn turbine. :P
replies(1): >>28231680 #
6. chii ◴[19 Aug 21 08:09 UTC] No.28231512[source]▶
also, you can use light, instead of matter.

Termed the "halo drive", it's a very nice theoretical concept: https://www.youtube.com/watch?v=rFqL9CkNxXw

7. avereveard ◴[19 Aug 21 08:43 UTC] No.28231680[source]▶
steampunk had it right