A comet's tail always points away from the sun.
2
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
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The earth travels through space at 660,000 miles per hour.
189
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Some asteroids have other asteroids orbiting them.
131