The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Summer on Uranus lasts for 21 years.
358
From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
22
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
Sound doesn't travel in space.
255
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16