Pluto is smaller than Russia.
9
Earth is the only planet in our solar system that's not named after a god or goddess.
17
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
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14