There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Summer on Uranus lasts for 21 years.
358
41% of the moon is not visible from earth at any time.
103
Some asteroids have other asteroids orbiting them.
131
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Astronauts get taller when they are in space.
224