41% of the moon is not visible from earth at any time.
103
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The ashes of the man who discovered Pluto are currently en route to dwarf planet, scheduled to arrive on the 14th of July, 2015.
11
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
More than 20 million meteoroids enter Earth's atmosphere every day.
139