Here is an interesting page.
http://imagine.gsfc.nasa.gov/docs/ask_astro/snr.html
----- Original Message -----
From: Bill Payne <bpayne15@juno.com>
To: <asa@calvin.edu>
Sent: Sunday, January 21, 2001 10:03 AM
Subject: SN 1987A
> Recently there was some discussion about the super nova SN1987A. What is
> supposed to be the measured diameter of the shell around the super nova?
>
> Thanks!
>
> Bill
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