Jim, That is a very interesting gif. I sometimes forget how much these things can change over relatively short time scales. Very Cool! Tyler _____________________________________________ -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Jim Gibson Sent: Sunday, January 25, 2009 7:48 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] White dwarfs and YOU By the way, for your viewing pleasure I have uploaded a gif file of M1 showing the expansion of M1 over 30 years. There are 2 images, one taken in 1970 and the other in 2000. While M1 is not a White Dwarf the expansion of the nebula may lend itself to some of the discussion we have been having. If the luminosity were constant and I am not saying it is then one can imagine just by the expansion alone that luminosity would have to be spread out over a larger area. Heck, I have seen 30 years twice. That expansion is just a poof. See image here: http://www.slas.us/gallery2/main.php?g2_itemId=868 JG _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com