The Universe Would Be Very Different Without Dark Matter

One of the most puzzling and counterintuitive facts about the Universe is that all of the "stuff" that's familiar to us in our day-to-day lives on Earth makes up just 5% of all that's out there. The protons, neutrons, and electrons that make up all the normal matter found in our bodies, the planet, the Solar System and throughout the galaxy make up only a fraction of what's out there.

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