What invisible substance is thought to make up 27% of the universe's total mass-energy content?
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Dark Matter
Dark matter does not emit, absorb, or reflect light, making it invisible to telescopes. Its existence is inferred from its gravitational effects on visible matter, such as the rotation of galaxies.
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- Which invisible substance, inferred from its gravitational effects on galaxies, accounts for 27% of the universe's mass-energy?