Sound doesn't travel in space.
255
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
The population of the Earth has more than doubled since 1950.
151
Earth is the only planet in our solar system that's not named after a god or goddess.
17
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
Today's top fuel dragsters take off with more force than the space shuttle.
120
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5