A simple physical and chemical characteristic must start, but not life on earth, but in the sun; in fact, in the very centre of the sun. Here, the source of the energy that the sun constantly pours out into space, the light and heat. This energy librated the center of the sun to the billions of atoms of hydrogen nuclear collide each other and the fusion, form the helium nuclei, so, release some of the energy stored in the nucleus of atoms. The output of light and heat of the sun to some 600 million tons of hydrogen be converted into helium in the sun again. This the sun has been doing for several thousand of a year.
Nuclear energy is released at the sun’s center for high-energy gamma rays. This is a kind of electromagnetic radiation, like light and radio waves, just very much shorter wavelength. This gamma radiation is absorbed by atoms inside the sun to be reemitted at slightly longer wavelengths. This radiation is in its will be absorbed, and then released. Energy filters through the layer, it passes through the solar interior the X-ray part of the spectrum turned into the light. In this stage, the energy to what we call the solar surface, and can escape into space without being absorbed further by solar atoms. Only a small fraction of the sun’s light and heat is emitted in such directions that after passing unhindered through interplanetary space released, it hits the earth.
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2011年9月30日星期五
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