Mars had an oxygen-rich atmosphere around 4 billion years ago
13
A comet's tail always points away from the sun.
2
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
The sun puts out more power in 1 second than mankind has ever used within human existence.
14
It would take more than 150 years to drive a car to the sun.
569
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
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