Word: five-hundredth
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Dates: during 1950-1950
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...with a special instrument. It proved to be only 3,600 miles in diameter. So Pluto has less than half the earth's diameter (7,920 miles) and is about one-tenth its mass. It is slightly larger than Mercury and considerably smaller than Mars, less than one five-hundredth the size of its neighbor Neptune (over 30,000 miles in diameter...