[ExI] extropy-chat Digest, Vol 148, Issue 11

Anders Sandberg anders at aleph.se
Tue Jan 26 11:26:45 UTC 2016

On 2016-01-26 01:31, Keith Henson wrote:
> One of the arguments used against it being alien mega structures is 
> the lack of IR. That's kind of funny when you consider we are far 
> along with the James Webb telescope. Looking into a giant telescope 
> like JW (or certain kinds of power satellites) we would not see excess 
> IR.

Actually, the Webb telescope is radiating a lot of IR in most 
directions. It is only the the business end that is cold.

[ If you have an object of finite temperature and radiate its IR into a 
fraction of the sky, the total volume where it is detectable (assuming 
some fixed detection threshold) actually increases! ]

Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University

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