The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The Earth gets 100 tons heavier every day due to falling space dust.
673
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
41% of the moon is not visible from earth at any time.
103
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
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