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We know that dark matter exists because it got gravity, though it is invisible. It hold galaxy and Universes.

There is a theory there many other parallel universe outside our universe and dark matter holds those universe up and some scientists says that dark matter are just mass of the matter of the parallel universe. It sounds crazy but that is the Law of Physics.

However there is not exact explanation of what dark matter really is, so there are still Noble Prices for those who can come up with a reasonable explanation.

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13y ago

What else can I help you with?