So if 2⁄3 of the sun’s energy is getting re-radiated in the infrared, Earth would actually stay warm enough to keep its atmosphere gaseous—a little guessing gives an average surface temperature of −60 Celsius.
That is, until the Matrioshka brain gets built, in which case assuming no efficiency gains, the radiation will drop to 44% of its original, then 30%, then 20%, etc.
A shell in a Matrioshka brain (more generally, a Dyson sphere being used for computation) reradiates 100% of the energy it captures, just at a lower temperature.
Yeah, the energy radiated to infinity only gets reduced if it’s being used for something long-term, like disassembling the sun or sending off energy-intensive intergalactic probes.
That is, until the Matrioshka brain gets built, in which case assuming no efficiency gains, the radiation will drop to 44% of its original, then 30%, then 20%, etc.
A shell in a Matrioshka brain (more generally, a Dyson sphere being used for computation) reradiates 100% of the energy it captures, just at a lower temperature.
Yeah, the energy radiated to infinity only gets reduced if it’s being used for something long-term, like disassembling the sun or sending off energy-intensive intergalactic probes.