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There is a lot of evidence that suggests the existence of dark matter, including the way galaxies rotate and the way normal matter is distributed within them. However, the nature of dark matter is still not well understood, and there are some theories that suggest it may not exist at all.
If you're interested in learning more about the concept of dark matter, there are many scientific papers and articles that you can read on the subject. Some useful papers to start with might include:
- "Dark Matter and Cosmic Structure" by Jeremiah P. Ostriker and Paul J. Steinhardt
- "Dark Matter in the Universe" by Jacco van Loon
- "Dark Matter: A Primer" by Dan Hooper
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