An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
41% of the moon is not visible from earth at any time.
103
Only 55% of Americans know that the sun is a star.
986
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Pluto is smaller than Russia.
9
Jupiter is bigger than all the other planets combined.
254