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What is dark matter?

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Dark matter is a hypothetical form of matter that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects on visible matter. It is believed to make up about 27% of the universe, with ordinary matter (like atoms and molecules) making up only about 5% of the universe. Scientists are still working to understand the nature of dark matter and its role in the cosmos.
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