Summer on Uranus lasts for 21 years.
358
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
Sound doesn't travel in space.
255
Some asteroids have other asteroids orbiting them.
131
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20