The Hercules galaxy cluster

If your observing site is dark and you have access to at least a 14-inch telescope, do yourself a favor and target the Hercules Galaxy Cluster. Its main official designation is Abell 2151, a member of a catalog of 2,712 rich northern clusters of galaxies originally published by American astronomer George O. Abell. Later inclusionsContinue reading “The Hercules galaxy cluster”
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