Information Related to "A Planet Perfect for Life"
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Could life on earth be the product of a blind watchmaker or no watchmaker at all? Could it be strictly the result of blind chance?
Some scientists have concluded that earth may be the only planet in the universe that harbors life because the conditions necessary for life are so exacting that the possibility of life on other planets is infinitesimal.
Earth's atmosphere
Earth's atmosphere is one way our planet is finely tuned for life. No other planet in our solar system has anything remotely like it. High in the atmosphere, ozone blocks cancer-causing radiation emanating from the sun. The atmosphere shields us from meteors, burning up the overwhelming majority long before they reach earth. Otherwise they would cause great damage and loss of life.
Our atmosphere contains a mixture of gases in perfect proportions to sustain life. Oxygen makes up 21 percent of our air. Without oxygen, all animate life-including humans-would die in minutes. But too much oxygen is toxic and makes combustible materials more flammable. If the proportion of oxygen in the air increased to only 24 percent, destructive fires would frequently break out and be much harder to bring under control. Objects around us could literally burst into flame.
Nitrogen, making up 78 percent of earth's atmosphere, dilutes the oxygen and serves a vital function as a fertilizer for plants. During thunderstorms millions of lightning bolts around the earth each day combine some nitrogen with oxygen, creating compounds that are then washed to earth by rain, where they can be utilized by plants.
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