Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Jupiter is bigger than all the other planets combined.
254
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
It takes eight and a half minutes for light to get from the sun to earth.
159
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Venus is the only planet that rotates clockwise.
310