Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
Venus is the only planet that rotates clockwise.
310
Only 55% of Americans know that the sun is a star.
986
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Jupiter is bigger than all the other planets combined.
254
41% of the moon is not visible from earth at any time.
103