A comet's tail always points away from the sun.
2
41% of the moon is not visible from earth at any time.
103
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The light hitting the earth right now is 30 thousand years old.
163
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
Only 55% of Americans know that the sun is a star.
986