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About 4% of the energy in our Universe consists of matter (a form of energy) that we understand.

About 16% is something that causes gravitational attraction but has almost no other interaction with matter. We know this stuff is out there, but we're not sure exactly what it is. Hence our name for it is "dark matter."

And about 80% of the energy in our Universe is something that is forcing the space between galaxies to expand at an increasing rate. We THOUGHT that the expansion first seen by Hubble was at a near constant rate, or at least one that was being slowed by gravity. But we were wrong -- the expansion rate is actually INCREASING over time -- SOME type of energy is moving galaxies apart from each other. Again, we don't know WHERE this energy is coming from, we only know that it exists. Hence our name for this form of energy is "dark energy."

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13y ago

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