Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
14
There are more nerve cells in the human brain than there are stars in the Milky Way.
349
It 'snows' metal on Venus.
13
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Earth is the only planet in our solar system that's not named after a god or goddess.
17