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Unexpected Dark Matter Discovery

4 Nov 2020, 13:00 UTC
Unexpected Dark Matter Discovery
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Wikipedia dicit:
Dark matter is hypothesized to be a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10−27 kg/m3. Support for its presence is drawn from a variety of astrophysical observations, including gravitational effects that under current theories of gravity do not make sense, unless more matter is present than can be seen. For this reason, the hypothesis has been created that dark matter exists, is abundant in the universe, and has had a strong influence on its structure and evolution. The name is due to the fact that by all observations, should dark matter exist, it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect or emit electromagnetic radiation, and is therefore difficult to detect.
Primary support for dark matter comes from calculations showing that many galaxies would fly apart, or that they would not have formed or would not move as they do, if they did not contain a large amount of unseen matter. Other lines of evidence include observations in gravitational lensing and in the cosmic microwave background, along with ...

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