Pluto is smaller than Russia.
9
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
22
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
The center of the galaxy tastes like raspberries and smells like rum, according to astronomers.
4