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Please help to expand this article, if you can. —Preceding unsigned comment added by 68.116.43.139 ( talk) 12:38, 26 February 2010 (UTC) reply

Just a quick note to let everyone know. The Astronomy 533 graduate astronomy class at the University of Michigan is updating a small number of astronomy-related wiki pages, this is one of them. The page will be significantly changed; please feel free to have a look when it comes online in mid-December. EFBell ( talk) 20:42, 18 November 2010 (UTC) reply

It looks good overall. Thank you for the expansion. Regards, RJH ( talk) 03:58, 23 January 2012 (UTC) reply