Quasars are the very bright centers of distant galaxies that are powered by supermassive black holes.
Illustration: ESO/M. Kornmesser
Scientists began developing theories about black holes more than a hundred years ago. University of Arizona professor Sam Gralla explains why the existence of black holes continues to raise questions about the basic concepts of physics. He will be the leadoff speaker for this year’s College of Science lecture series next week.
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