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
Summer on Uranus lasts for 21 years.
358
Pluto is smaller than Russia.
9
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
A comet's tail always points away from the sun.
2