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A comment on Dark Matter: The Situation Has Changed. Parent comment

Re:Dark Matter: The Situation Has Changed by forgotpwd16 on Saturday May 08, 2021 @09:50AM (#27087106)
One 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

[2]: https://arxiv.org/abs/1306.4013

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Re:Dark Matter: The Situation Has Changed by paul_f on Saturday May 08, 2021 @04:01PM (#27090198)
What's truly amazing is that all 10 quadrillion spheres are dedicated to cryptocurrency mining.
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Re:Dark Matter: The Situation Has Changed by samatman on Saturday May 08, 2021 @06:58PM (#27091563)
A common misconception, up to 18% are in fact running Doom.
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Re:Dark Matter: The Situation Has Changed by Fooloo on Saturday May 08, 2021 @01:06PM (#27088909)
wouldn't you undercount the stars enclosed?
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Re:Dark Matter: The Situation Has Changed by forgotpwd16 on Saturday May 08, 2021 @01:14PM (#27088981)
True. 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.
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