The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
It 'snows' metal on Venus.
13
Venus is the only planet that rotates clockwise.
310
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
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
Only 55% of Americans know that the sun is a star.
986
Sound doesn't travel in space.
255