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Space The Hercules Cluster of Galaxies

Discussion in 'Tech, Science, and Space' started by Robby, Jul 16, 2009.

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  1. Robby

    Robby The Robot

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    NASA Astronomy Picture Of The Day
    The Hercules Cluster of Galaxies


    [​IMG]


    The Hercules Cluster of Galaxies
    Credit & Copyright: Tony Hallas

    Explanation: These are galaxies of the Hercules Cluster, an archipelago of island universes a mere 500 million light-years away. Also known as Abell 2151, this cluster is loaded with gas and dust rich, star-forming spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. The colors in this remarkably deep composite image clearly show the star forming galaxies with a blue tint and galaxies with older stellar populations with a yellowish cast. The sharp picture spans about 3/4 degree across the cluster center, corresponding to over 6 million light-years at the cluster's estimated distance. In the cosmic vista many galaxies seem to be colliding or merging while others seem distorted - clear evidence that cluster galaxies commonly interact. In fact, the Hercules Cluster itself may be seen as the result of ongoing mergers of smaller galaxy clusters and is thought to be similar to young galaxy clusters in the much more distant, early Universe.



    (Via NASA)
     

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