A comet's tail always points away from the sun.
2
If two pieces of metal touch in space, they become permanently stuck together.
808
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
The light hitting the earth right now is 30 thousand years old.
163
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
Earth is the only planet in our solar system that's not named after a god or goddess.
17