Re: MEDIA: NOVA on Gamma Ray Bursters

From: John Clark (
Date: Thu Jan 10 2002 - 10:04:39 MST

>>If there was a civilization a billion or even a million years in
>>advanced of our own then the universe should look engineered.
>>It doesn't.

Robert J. Bradbury <> Wrote:

>Assumes that there is some reason to engineer the universe.

Assumes that the structure of the natural universe and the desires
of extraterrestrial civilizations, all extraterrestrial civilizations,
is not identical; a very reasonable assumption I think.

>This is an entirely an engineer-morphic perspective.

Yes. Any reason that's bad?

>the most advanced civilizations would only radiate heat energy
>at slightly above cosmic microwave background radiation temperature

But that's exactly my point. If ET exists then when we look into the
universe we should see nothing but microwaves and infrared, but we
see a lot more. Why? Of course you can invoke vague new laws of
physics to explain this but that doesn't seem very productive as I can
just counter them with vague new laws of physics of my own. Based
on what we know now ET can not exist.

>Its the cosmic ray "jets" that pack a larger effective radiation
>dose and arrive over a much longer period

I read the paper, the muon flux is made by gamma rays hitting the upper
atmosphere so they'd only last a few seconds too. As for cosmic rays
directly from the source lasting for two days, well maybe, but nobody has
ever detected cosmic rays from a Gamma Ray Burster and nobody
really knows what they are so I 'd take that estimate with a grain of
salt. Incidentally Eta Carinae the most likely local candidate is never
above the horizon in the northern hemisphere.

I still don't think this can explain the Fermi Paradox (although it may
explain some of Earth's mass extinctions), it probably wouldn't be
worse than a comet impact and anybody just a few years in
advance of us will be able to predict such a thing and go deep.

           John K Clark

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