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09-April-2008, 05:43 PM
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GLAST and Kardeshev galaxies
Suppose a Kardeshev Three civilization is using a Dyson Sphere around a Sol type star to transmit an omnidirectional gamma ray signal in GLAST's detection spectrum. Assume the civilization is one Gigaparsec away. Can GLAST detect it?
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09-April-2008, 06:10 PM
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Let's say that the gammas are 1 MeV. The sphere would radiate 2.5x1039 per second. A 1 Gigaparsec sphere has a surface area of 1x1052 square meters, so GLAST would be getting much less than one gamma per century from this thing. I'd say no.
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