The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
There are two golf balls sitting on the moon.
721
The heart of an astronaut actually gets smaller when in outer space.
216
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
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The earth travels through space at 660,000 miles per hour.
189