In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
The light hitting the earth right now is 30 thousand years old.
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
It takes eight and a half minutes for light to get from the sun to earth.
Lightning strikes about 6,000 times per minute on this planet!
The earth is .02 degrees hotter during a full moon.
The population of the Earth has more than doubled since 1950.
If you went out into space, you would explode before you suffocated because there's no air pressure.
Jupiter's moon Ganymede, is larger than the planet Mercury!
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
The earth rotates more slowly on its axis in March than in September.
More than 20 million meteoroids enter Earth's atmosphere every day.
Some asteroids have other asteroids orbiting them.
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
Today's top fuel dragsters take off with more force than the space shuttle.
The Earth gets heavier each day by tons, as meteoric dust settles on it.
The temperature of the earth's interior increases by 1 degree every 60 feet down.