41% of the moon is not visible from earth at any time.
103
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
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
Summer on Uranus lasts for 21 years.
358
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
Sound doesn't travel in space.
255