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From: mike@bambi.UUCP (Michael Caplinger)
Newsgroups: net.sf-lovers
Subject: Re: visible civilization
Message-ID: <27@bambi.UUCP>
Date: Wed, 7-Aug-85 09:58:55 EDT
Article-I.D.: bambi.27
Posted: Wed Aug  7 09:58:55 1985
Date-Received: Sun, 11-Aug-85 04:25:52 EDT
References: <3076@topaz.ARPA> <1356@uwmacc.UUCP> <1095@umcp-cs.UUCP>
Reply-To: mike@bambi.UUCP (Michael Caplinger)
Organization: Bell Communications Research
Lines: 12


Actually, the most powerful radio emitters on the planet are early-warning
radars, which would look like nearly monochromatic sources along the
Earth's limbs.  (Since they're pointing roughly horizontally, you couldn't
see one near the middle of the disk.)

It would be fairly easy to figure out what size antenna would be needed
to spatially resolve multiple radars from distance X.  I suspect
that it would be quite easy to find such objects with planetary-
system-baseline VLBI, not to mention the anomolous emission spectrum.

	- Mike