The light hitting the earth right now is 30 thousand years old.
163
There are two golf balls sitting on the moon.
721
Sound doesn't travel in space.
255
Pluto is smaller than Russia.
9
The earth travels through space at 660,000 miles per hour.
189
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9