41% of the moon is not visible from earth at any time.
103
The sun is 330,330 times larger than the earth!
190
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Sound doesn't travel in space.
255
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
The light hitting the earth right now is 30 thousand years old.
163
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178