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LESSON 5 · Galaxies & the Cosmic Web

PAUSE TO THINK

Where does the name "dark matter" come from?

Fritz Zwicky coined it in 1933

Studying the Coma Cluster in 1933, Fritz Zwicky called the missing mass "dunkle Materie" — German for dark matter. "Dark" simply means it gives off no light we can see; it is unseen, not literally black.

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