There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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The heart of an astronaut actually gets smaller when in outer space.
216
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
It takes eight and a half minutes for light to get from the sun to earth.
159