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
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
Earth is the only planet in our solar system that's not named after a god or goddess.
17
It 'snows' metal on Venus.
13
A comet's tail always points away from the sun.
2
Sound doesn't travel in space.
255