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 Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Jupiter's magnetosphere is the largest single structure inside the Solar System. If you could see it with your eyes, it would appear larger than our full Moon.
8
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160