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GCET Student Worksheet (The Galaxies and Cosmos Explorer Tool) Introduction: Our own Milky Way galaxy contains over 200 billion stars. Yet it is just one of hundreds of billions of galaxies in the visible universe. Hundr
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Document Date: 2009-10-20 10:47:48
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GCET Student Worksheet (The Galaxies and Cosmos Explorer Tool) Introduction: Our own Milky Way galaxy contains over 200 billion stars. Yet it is just one of hundreds of billions of galaxies in the visible universe. Hundr