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  1. Beth's daily cup of coffee

    If the Milky Way was the size of Beth's coffee cup, how big would the rest of the universe be? A. The Milky Way has a radius of about 50,000 light years. The visible universe has a radius of about 15 billion light years or 300,000 times the size of the Milky Way. So for Beth's 8-centimeter-wide co...
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