[ExI] Gaian Bottleneck

[Anders Sandberg]

On 2016-01-25 17:55, John Clark wrote:​
> ​
> And if it's a Dyson Sphere it's odd we can't pick up any intelligent 
> radio signals from it; the star is only 1
> ​ ,​
> 480 light years away and the Arecibo Observatory could detect a 
> similar instrument 50,000 light years away but we don't hear a peep. 
> People have looked with optical telescopes
> ​ for
>  flashes of LASER light coming from the vicinity of the star and 
> haven't found those either.

Even more compelling is the absence of IR emissions. If it had been a 
Dyson shell we should have seen a fraction of the stars luminosity 
reradiated in the IR spectrum. Aliens might keep silent for alien 
reasons, but it is hard to cheat thermodynamics.


-- 
Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20160125/e18d1383/attachment.html>