Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Venus is the only planet that rotates clockwise.
310
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Summer on Uranus lasts for 21 years.
358