what is dark matter
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Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density. ... Because dark matter has not yet been observed directly, if it exists, it must barely interact with ordinary baryonic matter and radiation, except through gravity.
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Dark Matter is referred to the hypothetical matter that scientists have not been able to locate in the universe - either through telescopes or using any other technological method. 27% of the matter in the universe is said to be dark matter. Its existence came to the fore because of its gravitational effects on matters that are visible in the universe.
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