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https://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy
Less than 5% of all matter in the universe is visible to human instruments.
It’s only light to us because we see it. Lots of other things put out radiation we can’t look at directly.
It’s maybe counterintuitive, but around 8/9 of normal matter is in interstellar and intergalactic space.
Source: I remembered it and searched for it just now.