The origins of the faint glow, which emits 3.5 kiloelectronvolts (keV) of energy, are especially intriguing because the signal matches key predictions about the nature of dark matter, a mysterious substance from which most of the universe is made. For years, scientists have debated whether the glow was long-sought evidence of a hypothetical particle that makes up dark matter. A clear answer to that question could finally unravel the true nature of dark matter, which is the “holy grail of astroparticle physics at the moment,” said Benjamin Safdi, an astrophysicist at the University of Michigan, in a call.
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