Joe, See image of M13 at http://www.redorbit.com/images/gallery/hubble_space_telescope/hubble_acswfpc 2_image_of_globular_cluster_m13/18/40/index.html taken by Hubble. There are still many blue stars but more are older reddish stars. The blue stars, because they are in general more luminous, appear more common than they really are. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Thursday, June 11, 2009 12:30 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] M22, Part 2 Joe, take a look at this: http://antwrp.gsfc.nasa.gov/apod/globular_clusters.html On Thu, Jun 11, 2009 at 10:48 AM, Joe Bauman <josephmbauman@yahoo.com>wrote:
This makes me wonder if one of my basic assumptions is wrong. I thought all globulars were extremely ancient. But could a population of blue stars be as old as red ones? Can someone help me understand this? Thanks, Joe
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