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 density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
The population of the Earth has more than doubled since 1950.
151
The earth rotates more slowly on its axis in March than in September.
145
