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
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
The heart of an astronaut actually gets smaller when in outer space.
216
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
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