Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union.
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Neptune is the farthest known major planet from the Sun.
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Neptune appears blue because of methane in its atmosphere.
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The Moon slowly moves away from Earth by a few centimeters each year.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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Project Blue Book investigated reports of unidentified flying objects.
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Saturn's largest moon is Titan.
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Cosmic microwave background radiation is evidence of the early universe.
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The Moon's gravity affects ocean tides.
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