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
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Pluto is smaller than Russia.
9
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Sound doesn't travel in space.
255
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Some asteroids have other asteroids orbiting them.
131