In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Jupiter is bigger than all the other planets combined.
254
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
If two pieces of metal touch in space, they become permanently stuck together.
808
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
Pluto is smaller than Russia.
9
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82