There are stars that orbit each other so closely they share material.
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The Earth's orbit determines the length of the year.
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The Earth's magnetic poles slowly shift over time.
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The Moon is slowly moving away from Earth.
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The Milky Way galaxy contains billions of stars.
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Saturn's largest moon is Titan.
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The Earth's atmosphere gradually thins into outer space.
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Neptune is the farthest known major planet from the Sun.
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The Sun occasionally emits powerful solar flares.
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