The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
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
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
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
There are two golf balls sitting on the moon.
721
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
Earth is the only planet in our solar system that's not named after a god or goddess.
17