41% of the moon is not visible from earth at any time.
103
Summer on Uranus lasts for 21 years.
358
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
15
The earth travels through space at 660,000 miles per hour.
189
A car traveling 100 mph would take more than 29 million years to reach the nearest star (to our solar system)
88
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121