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Surprising Science —

The Hercules Cluster of Galaxies

hercules galaxy cluster
Most of the largest known galaxies in the Universe are found at the hearts of massive galaxy clusters, like the Hercules galaxy cluster shown here. If galaxies assemble and grow over cosmic time, it's the closest galaxies, on average, that will be most likely to be the largest ones we observe today, whereas if the Steady State model and the perfect cosmological principle are correct, galaxies like these will be found at all distances.
(Credit: ESO/INAF-VST/OmegaCAM. Acknowledgement: OmegaCen/Astro-WISE/Kapteyn Institute)
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This gem box is an archipelago of dust and gas rich galaxies called the Hercules Cluster, some 500 million light-years away.

NASA has more:

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. Diffraction spikes around brighter foreground stars in our own Milky Way galaxy are produced by the imaging telescope’s mirror support vanes. 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.

Image credit: NASA

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