The light hitting the earth right now is 30 thousand years old.
163
A comet's tail always points away from the sun.
2
Pluto is smaller than Russia.
9
Sound doesn't travel in space.
255
NASA invented baby food as we know it today.
7
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7