Dark matter is one of the biggest puzzles in astronomy and physics: despite making up 85 percent of the matter in the universe, no one knows what it is or can see it. [...] There are many hypotheses about the nature of dark matter. Some consider it to be made of exotic particles. Among the latter, there is one that describes it as a set of ultralight dark photons. This hypothesis, according to the conclusions of a recent study, carried out by the international team of Matteo Viel, from the International School of Advanced Studies (SISSA) in Italy, is in excellent agreement with the observations made by the Cosmic Origin Spectrograph (COS) aboard the Hubble Space Telescope.
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