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Dark Matter and Black Holes
- Dark matter is invisible matter that does not interact with light, unlike ordinary matter.
- Black holes absorb light, making them candidates to explain dark matter's invisibility.
Black Hole Discoveries
- Astronomers detected black holes by observing x-rays from systems like Cygnus X1, proving their existence.
- The Event Horizon Telescope produced the first image of a black hole's event horizon's edge.
Normal Black Holes Can't Explain Dark Matter
- Ordinary black holes formed from stars can't explain dark matter due to insufficient normal matter.
- The universe's known protons, neutrons, and electrons cannot combine to create enough black holes.