Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
Only 55% of Americans know that the sun is a star.
986
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
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