The light hitting the earth right now is 30 thousand years old.
163
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
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
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
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
Summer on Uranus lasts for 21 years.
358
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10