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
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Sound doesn't travel in space.
255
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
The earth is .02 degrees hotter during a full moon.
157
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
It takes eight and a half minutes for light to get from the sun to earth.
159
The earth rotates more slowly on its axis in March than in September.
145