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The universe is made up of 2 types of matter: baryonic matter, which is made up of atoms, and dark matter which is not.
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Fritz Zwicky hypothesized that galaxies inside the Coma Cluster were being held intact by dark matter.
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Scientists believe that galaxies would break apart if dark matter were absent, causing the structures of the galaxy to fall apart.
So, the complete answers are:
- baryonic
- dark
- dark
- dark