Summer on Uranus lasts for 21 years.
358
The population of the Earth has more than doubled since 1950.
151
It takes eight and a half minutes for light to get from the sun to earth.
159
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
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Lightning strikes about 6,000 times per minute on this planet!
158
Astronauts get taller when they are in space.
224