The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The heart of an astronaut actually gets smaller when in outer space.
216
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219