The heart of an astronaut actually gets smaller when in outer space.
216
Venus is the only planet that rotates clockwise.
310
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
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
41% of the moon is not visible from earth at any time.
103
There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
11
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
Some asteroids have other asteroids orbiting them.
131