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
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
A comet's tail always points away from the sun.
2
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The Earth gets 100 tons heavier every day due to falling space dust.
673