Sound doesn't travel in space.
255
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Summer on Uranus lasts for 21 years.
358
Earth is the only planet in our solar system that's not named after a god or goddess.
17