Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Sound doesn't travel in space.
255
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
The sun puts out more power in 1 second than mankind has ever used within human existence.
14
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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82