archiv~1: SETI Gravity Influence & KikStrt?

SETI Gravity Influence & KikStrt?
Sat, 14 Nov 1998 09:33:29 +0000


------- Forwarded Message Follows -------
From: David Woolley <>
Subject: Re: SETI Gravity Influence on Intergalactic Signals?
Date: Fri, 13 Nov 1998 08:27:54 +0000 (GMT)

> If an ET civilization were to transmit an optical beacon, say, a
> coherent signal with no modulation. Should this signal pass through
> a large body's gravity field, what effect if any is imparted on the
> signal? Does phase change?

It would be deflected, possibly to the point of producing two images
of the source (this does happen for starlight).

The deflected path would be longer, so the phase would be delayed,
but, unless you had some phase reference that would be academic.

The LIGO experiment, two spacecraft positioned apart, a
coherent link between the spacecraft through gravity field. Then
comparing the phase/timing?


Walt Williams, 98.11.14