The measurement of the mysterious form of matter around these quasar galaxies could have profound implications for our understanding of how the cosmos has evolved.
Diagram shows the mass of dark matter haloes around quasars at the heart of ancient active galaxies.
Astronomers can infer the presence of dark matter via its gravitational effects and the influence of this effect on standard everyday matter that comprises stars, cosmic dust and gas clouds, planets in galaxies as well as on light passing through those galaxies. This elusive gravitational effect ultimately led scientists to the realization that most galaxies must be wrapped in a dark matter halo of sorts.
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