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Dark Energy Camera probes the Coma Cluster, an inspiration for the theory of dark matter
The theory emerged in 1937 when Swiss astronomer Fritz Zwicky noticed that the Coma Cluster galaxies behaved as if they were under the influence of vast amounts of unobservable "dark" matter.
Thomasville Times-Enterprise23d
On Astronomy — Dark Matter and Dark Energy
In 1933, the Bulgarian-born astronomer Fritz Zwicky, working in the U.S., noticed unexpected motion in galaxies. Zwicky inferred gravitational effects of unseen material which he called Dark Matter.