James Webb data reveal pristine gas irradiated by energetic light some 450 million years after the Big Bang — a sign it may ...

A potential dark galaxy — one made primarily of dark matter — may have been spotted in the local universe. Dark galaxies are theoretical, starless systems whose discovery could help astronomers better ...

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For decades, astronomers have searched for something they cannot see. They call it dark matter—an invisible substance thought to make up most of the universe’s mass, sculpting galaxies and clusters ...