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Article posted: 2/18/2013 11:51 AM

The Milky Way is just one of many galaxies

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The Milky Way spreads across the night sky over Mormon Row, a historic settlement in Grand Teton National Park near Jackson, Wyo.

Associated Press

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A student in Katherine Crawford's fifth-grade class at West Oak Middle School in Mundelein asked, "How are other galaxies discovered?"