One mystery of dark matter is that it makes up the vast majority of all the matter in the Universe, yet we know surprisingly little about it. This mysterious “something” cannot be seen through light or any other form of electromagnetism — hence the name “dark.” However, dark matter does emit gravitational forces, without which galaxies and clusters of galaxies would fly apart. A new study, based on observations of distant galaxy clusters seen by the Hubble Space Telescope and the Very Large Telescope in Chile reveal dark matter behaves differently than simulations predict, suggesting our models of dark matter…
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