The Milky Way galaxy contains between 100 and 400 billion stars and is about 100,000 light-years across.
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Saturn could float in water because its density is low.
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The Moon completes its phases in about 29.5 days.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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The Milky Way is estimated to contain hundreds of billions of stars.
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The light you see from some stars today began traveling before humans existed.
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