Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Pluto is smaller than Russia.
9
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
It takes eight and a half minutes for light to get from the sun to earth.
159
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