The ring’s discovery is among the strongest evidence yet that dark matter exists. Astronomers have long suspected the existence of the invisible substance as the source of additional gravity that holds together galaxy clusters.
Dark matter makes up most of the universe’s material. Ordinary matter, which makes up stars and planets, comprises only a small percent of the universe’s matter.
The ring, which measures 2.6 million light-years across, was found in the cluster CL0024+17, located 5 billion light-years from Earth.
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