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About 5% of our Universe consists of baryonic matter; ie, stuff we fully understand.

Our Universe also contains about four times more mass in some form we DON'T understand, and that's why we call it "dark matter."

And about 75% of the energy of the Universe consists of something that is causing the rate of expansion of our Universe to speed up. It can't be something with mass, because mass would cause the rate of expansion to slow down. So it has be some form of energy we just don't understand -- so, for now, we simply call it "dark energy."

These two entities have nothing whatsoever in common other than the first word in the description we humans have given to them.

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13y ago

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