Clusters Photo Gallery by David Rosenthal at pbase.com

Clusters

"Star clusters are groups of stars which are gravitationally bound. Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars, while open clusters generally contain less than a few hundred members, and are often very young. Open clusters become disrupted over time by the gravitational influence of giant molecular clouds as they move through the galaxy, but cluster members will continue to move in broadly the same direction through space even though they are no longer gravitationally bound; they are then known as a stellar association, sometimes also referred to as a moving group." (Wikipedia)

M3 Wide Field	Double Cluster	M13-LRGB	:: 2011 ::	:: 2010 ::
:: 2009 ::	:: 2008 ::	:: 2007 ::	:: 2006 ::	:: 2012 ::

comment |

Terry		04-Aug-2009 00:34
David, Your astrophotography photos don't say if they were shot in your backyard or at a dark site. Terry

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