Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  IC 3943  ·  IC 3946  ·  IC 3947  ·  IC 3949  ·  IC 3955  ·  IC 3957  ·  IC 3959  ·  IC 3960  ·  IC 3963  ·  IC 3968  ·  IC 3973  ·  IC 3976  ·  IC 3998  ·  IC 4011  ·  IC 4012  ·  IC 4021  ·  IC 4026  ·  IC 4030  ·  IC 4033  ·  IC 4040  ·  IC 4041  ·  IC 4042  ·  IC 4044  ·  IC 4045  ·  IC 4051  ·  IC 839  ·  NGC 4848  ·  NGC 4850  ·  NGC 4851  ·  NGC 4853  ·  And 307 more.
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Coma Cluster (Abell 1656), Tom Engwall
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Coma Cluster (Abell 1656)

Getting plate-solving status, please wait...
Coma Cluster (Abell 1656), Tom Engwall
Powered byPixInsight

Coma Cluster (Abell 1656)

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The Coma Cluster is huge - around 321 million light years away - containing over 1000 galaxies. Wikipedia notes that it was one of the first places to observe gravitational anomalies that indicated unobserved mass. "In 1933, Fritz Zwicky showed that the galaxies of the Coma Cluster were moving too fast for the cluster to be bound together by the visible matter  of its galaxies." This unobservable mass is not what we call Dark Matter

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Coma Cluster (Abell 1656), Tom Engwall