Dark Matter
About 90% of the mass of the Coma cluster is believed to be in the form of dark matter. However, the distribution of dark matter throughout the cluster is poorly constrained.
Read more about this topic: Coma Cluster
Famous quotes containing the words dark and/or matter:
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Playing till too dark to see,
As their fathers watched them once,
As my father once watched me;”
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—Abraham Lincoln (1809–1865)