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 population of the Earth has more than doubled since 1950.
151
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
41% of the moon is not visible from earth at any time.
103
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
If two pieces of metal touch in space, they become permanently stuck together.
808
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175