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A flickering of a distant quasar may have settled a decade-old feud between two camps of astronomers over the true value of the Hubble constant, the rate at which the universe is expanding.
One approach to measuring the ardently sought constant is to compare how long it takes for light from a flickering source to reach Earth along two routes (A and B in the photograph). Light from a quasar (in this case, QSO 0957+561 ) is bent by the gravity of an...
