[ExI] Gravitational Waves Detected By LIGO!
giulio at gmail.com
Thu Feb 11 18:39:47 UTC 2016
The energy that kills an entire galaxy would be released as hard gamma rays. "Hot enough to break nuclei at 50,000 light years" (Egan's Diaspora)
> On Feb 11, 2016, at 6:50 PM, spike <spike66 at att.net> wrote:
> From: extropy-chat [mailto:extropy-chat-bounces at lists.extropy.org] On Behalf Of Anders Sandberg
> >…If we assume the energy release was around 10^50 J over a second, then the power per square meter at distance d is 10^50/(4 pi r^2) Watts. So the criticial distance if the danger power is P is r=sqrt(10^50/4 pi P). If we assume a megawatt/m^2 is enough to cause biosphere damage, then the distance is 298,000 lightyears. To wipe out more advanced civilizations I would expect a much higher P; for a gigawatt the range is 9,400 lightyears - bad in the central part of a galaxy, but not even covering it…
> Anders, cool, but we need to know how GW energy would interact with matter before we conclude that it would nuke biomes.
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