21
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
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22
The light hitting the earth right now is 30 thousand years old.
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23
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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24
It takes eight and a half minutes for light to get from the sun to earth.
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25
Lightning strikes about 6,000 times per minute on this planet!
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26
The earth is .02 degrees hotter during a full moon.
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27
The population of the Earth has more than doubled since 1950.
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28
If you went out into space, you would explode before you suffocated because there's no air pressure.
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29
Jupiter's moon Ganymede, is larger than the planet Mercury!
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30
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
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31
The earth rotates more slowly on its axis in March than in September.
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32
More than 20 million meteoroids enter Earth's atmosphere every day.
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33
Some asteroids have other asteroids orbiting them.
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34
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
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35
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
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36
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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37
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
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38
Today's top fuel dragsters take off with more force than the space shuttle.
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39
The Earth gets heavier each day by tons, as meteoric dust settles on it.
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40
The temperature of the earth's interior increases by 1 degree every 60 feet down.
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