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This month at AoT-Louisville: Quasars are the brightest objects in the
Universe, supermassive black holes which attract vast whirlpools of
gas around them, heated to millions of degrees.  These ``cosmic
lighthouses" illuminate lines of sight spanning billions of light
years, revealing the shadows of galaxy haloes beyond where we can see
the galaxies themselves.  Making cosmic maps of these haloes reveals
the largest agglomerations of galaxies in the Universe, billions of
light years across.  Gerry Williger (UL Physics) will give a guided tour.

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  • Gerard Williger

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