what is the meaning of dark matter
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The name dark matter refers to the fact that it is not appear to interact with observable electromagnetic radiation, such as light, and thus it is invisible to the entire electromagnetic spectrum, making it extremely difficult to detect using usual astronomical equipment.
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dark matter, a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).
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