[![This diagram traces the evolution of the universe from the Big Bang to the present. Two watershed epochs are shown. Not long after the Big Bang, light from the first stars burned off a fog of cold hydrogen in a process called re-ionization. At a later epoch, quasars, the black-hole-powered cores of active galaxies, pumped out enough ultraviolet light to re-ionize the primordial helium.]]A galactic heat wave 11 billion years ago unleashed fierce blasts of radiation that altered how some galaxies formed, a new study finds.
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