41% of the moon is not visible from earth at any time.
103
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
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Summer on Uranus lasts for 21 years.
358
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The population of the Earth has more than doubled since 1950.
151