You're right obviously, but a Matrioshka Brain would put out such a small amount of radiation, it'd be invisible for all sensor technology outside of, say, black hole lenses.
> a Matrioshka Brain would put out such a small amount of radiation, it'd be invisible for all sensor technology
A huge object emitting infrared radiation would be quite detectable.
At the level of energy output from our Sun, a Dyson sphere with a diameter of the Earth's orbit, would actually have a surface temperature of 395K or 122C. It would put out lots of infrared radiation, and would be very detectable against the cosmic background which has a radiation temperature of 2.7K.
Some SETI programs have looked for these, and already in 1984 we had the technology to observe, and as it turns out, to rule out any of these (Dyson spheres around stars with energy output comparable to our Sun) existing within the nearest 300 light years.
sampo|7 years ago
A huge object emitting infrared radiation would be quite detectable.
At the level of energy output from our Sun, a Dyson sphere with a diameter of the Earth's orbit, would actually have a surface temperature of 395K or 122C. It would put out lots of infrared radiation, and would be very detectable against the cosmic background which has a radiation temperature of 2.7K.
Some SETI programs have looked for these, and already in 1984 we had the technology to observe, and as it turns out, to rule out any of these (Dyson spheres around stars with energy output comparable to our Sun) existing within the nearest 300 light years.
https://www.aleph.se/Nada/dysonFAQ.html#HEAT
https://www.aleph.se/Nada/dysonFAQ.html#OBS
http://www.projectrho.com/public_html/rocket/weirdastronomy....