In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Pluto is smaller than Russia.
9
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
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 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
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
14