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Why do we think dark matter is made of particles?

Daniel and Kelly’s Extraordinary Universe

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How Much Dark Matter Has Disappeared From the Universe?

In order to explain how much dark matter has disappeared from the universe, you need a force with basically exactly the same is one of the forces we already have. The weak force is kind of weird rit it's really strangely weak. It's not like a basic, simple force that has the strength we understand. And then if you pick the weak scale mass, you get exactly the right mass density. So it's like two miracles that line up perfectly interesting.

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