http://www.astronomag.com/planetary/what-does-a-planetary-nebula-contribute-to-the-interstellar-medium Mon, 19 Apr 2010 04:20:59 -0400 http://wordpress.org/?v=2.8.4 hourly 1 http://www.astronomag.com/planetary/what-does-a-planetary-nebula-contribute-to-the-interstellar-medium/comment-page-1#comment-4407 ronwizfr Thu, 10 Dec 2009 22:04:59 +0000 http://www.astronomag.com/planetary/what-does-a-planetary-nebula-contribute-to-the-interstellar-medium#comment-4407 D) is definitely correct. I seem to remember that I have read about evidence for A) but it seems unlikely B) and C) are incorrect.<br><b>References : </b><br> D) is definitely correct.
I seem to remember that I have read about evidence for A) but it seems unlikely B) and C) are incorrect.
References :

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