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
A comet's tail always points away from the sun.
2
Pluto is smaller than Russia.
9
Summer on Uranus lasts for 21 years.
358
NASA invented baby food as we know it today.
7