Outside Dyson shells

Outside Dyson shells:

"Assuming our sphere appoximates a blackbody (e ~= 1) and then substituting ideal conditions (g = 9.81 m/s2, T = 300 K), we find that M must vary between 0.054 and 0.079 masses solar (the variance is caused by 3.5 <= nu <= 4.0).

By comparison, the 'end of the main sequence' -- that is, the theoretical point at which a main sequence star is unable to sustain itself by hydrogen fusion -- is at about 0.08 masses solar, but is not precisely known. Thus it might be possible to have Dyson shells with Earthlike conditions on their outside surfaces around the smallest hydrogen-burning stars in the Universe.

One other advantage to using red dwarfs is their immense lifespan -- the least-massive red dwarfs can last hundreds of billions or trillions of years."