In the Dark on Dark Matter

I think I need someone far cleverer than me to explain this to me. Dark Matter [wiki]…   In astronomy and cosmology, dark matter is matter that is inferred to exist from gravitational effects on visible matter and background radiation, but is undetectable byemitted or scattered electromagnetic radiation.[1] Its existence was hypothesized to account for discrepancies between measurements of the mass of galaxies, clusters of galaxies and the entire universe made […]

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