Space/Science — HabitableZone

Space/Science » in reply to Why would they be more likely to found in the outer regions of the galaxy?

Think ACs in a computer room on a really big scale

Because it is much cooler than near the center. Think civilizations and
computer minds on the scale of planets and small solar systems. They
will radiate a lot of heat that needs to be tempered and dissapated
somehow somewhere.

See this paper for the details:

http://arxiv.org/abs/astro-ph/0606102

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