The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Only 55% of Americans know that the sun is a star.
986
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
A comet's tail always points away from the sun.
2
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
It 'snows' metal on Venus.
13
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15