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Re: the lowest natural sound yet detected

Subject: Re: the lowest natural sound yet detected
From: Walter Knapp <>
Date: Sat, 20 Sep 2003 15:34:48 -0400
Dan Dugan wrote:

> You misunderstand the original evidence. No super-low-frequency
> electromagnetic signal has been detected. What has been seen
> (visually) is waves of compression and rarification in interstellar
> gas. From the photographs the speed and wavelength has been
> calculated. Compression waves in gas are properly described as sound.

Since it was the X-ray observatory, I would think it was not visual
exactly, but observed in the X-ray part of the electromagnetic spectrum.

In this case the wavelength given in light years must be the distance
between wave peaks. I expect the rate of travel of this shock wave is
much slower than light, so the wavelength would be much larger.

I wonder how much it's speed would change in intergalactic space as
opposed to interstellar, where the gas is thicker.

Certainly I'd expect it's attenuation with distance to be pretty great.



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