41% of the moon is not visible from earth at any time.
103
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
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
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194