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dwarf planets
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dwarf planets
-- Ceres, Pluto, Eris, Makemake, Haumea, Charon, Dysnomia
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errant
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They called these errant objects planets, a word that means wandering stars.
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look up
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Thousands of years ago, ancient astronomers looked up at the sky.
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think
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Some of the things they thought were stars were moving in ways they didn't expect.
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Pillow English Listening
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