Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The earth rotates more slowly on its axis in March than in September.
145
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The earth travels through space at 660,000 miles per hour.
189
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
The earth is .02 degrees hotter during a full moon.
157