In the 1930s, astronomer Fritz Zwicky noticed that the galaxies in the Coma Cluster were moving much faster than they should have been, given the amount of visible matter in the cluster. Zwicky suggested that there must be some unseen mass holding the galaxies together. He called this "Dunkle Materie" (or dark matter).

Since then, scientists have found evidence of dark matter in many other places, including galaxies, galaxy clusters, and the cosmic microwave background.

Dark matter refers to a hypothetical form of matter that does not interact with light or other forms of electromagnetic radiation, making it invisible and difficult to detect directly.

It makes up about 85% of the matter in the universe. We can't see it, but we know it's there because of its gravitational effects on visible matter.

The mystery of dark matter is one of the biggest unsolved problems in physics. But as scientists continue to study the universe, they are getting closer to solving this mystery.

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Additional visual material sourced from:

NASA
NASA GODDARD
NASA JPL

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