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How many dyson spheres do we need to account get rid of the dark matter and modified gravity?
by Fooloo 5y ago
How many dyson spheres do we need to account get rid of the dark matter and modified gravity?
- forgotpwd16 5y agoOne Dyson sphere of radius 1 AU (Sun-Earth distance) having mass 600 kg/m^2 (8-20 cm thick) will require[1] 10^26 kg of material. The Milky Way's dark mater halo is considered[2] to have mass 10^12 M_Sun = 10^42 kg. So you will need a total of 10^16 (10 quadrillion) spheres. [1]: https://www.aleph.se/Nada/dysonFAQ.html#ENOUGH https://www.aleph.se/Nada/dysonFAQ.html#ENOUGH [2]: https://arxiv.org/abs/1306.4013 https://arxiv.org/abs/1306.4013
- Fooloo 5y agowouldn't you undercount the stars enclosed?
- forgotpwd16 5y agoTrue. I only considered the spheres (shells) themselves. If you include the star then the result is even simpler. M_Sun is 10^30 kg so for a back of the envelope calculation you don't even have to consider the shell. Therefore you can say 10^12.
- paul_f 5y agoWhat's truly amazing is that all 10 quadrillion spheres are dedicated to cryptocurrency mining.
- samatman 5y agoA common misconception, up to 18% are in fact running Doom.
- gilbetron 5y agoDyson spheres would not qualify as dark matter, as they would be made of Baryonic matter.
- Keysh 5y agoDyson spheres would glow in the mid- and far-infrared (re-radiating energy absorbed from the enclosed star), and so would not be "dark".