There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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Only 55% of Americans know that the sun is a star.
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Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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Astronauts get taller when they are in space.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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