The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The population of the Earth has more than doubled since 1950.
151
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
Sound doesn't travel in space.
255
41% of the moon is not visible from earth at any time.
103
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46