There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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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
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The light hitting the earth right now is 30 thousand years old.
163
Summer on Uranus lasts for 21 years.
358
Jupiter's moon Ganymede, is larger than the planet Mercury!
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