Earth is the only planet in our solar system that's not named after a god or goddess.
17
A comet's tail always points away from the sun.
2
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
The light hitting the earth right now is 30 thousand years old.
163
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147