There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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Summer on Uranus lasts for 21 years.
358
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
11
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221