在學習、工作或生活中，大家都嘗試過寫作文吧，寫作文是培養人們的觀察力、聯想力、想象力、思考力和記憶力的重要手段。作文的注意事項有許多，你確定會寫嗎？下面是小編精心整理的.高考英語作文：能量的來源(The Source of Energy)，供大家參考借鑒，希望可以幫助到有需要的朋友。
a summary of the physical and chemical nature of life must begin, not on the earth, but in the sun; in fact, at the suns very center. it is here that is to be found the source of the energy that the sun constantly pours out into space as light and heat. this energy is liberated at the center of the sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms.
the output of light and heat of the sun requires that some 600 million tons of hydrogen be converted into helium in the sun every second. this the sun has been doing for several thousands of millions of years. the nuclear energy is released at the suns center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength. this gamma radiation is absorbed by atoms inside the sun to be reemitted at slightly longer wavelengths. this radiation, in its turn is absorbed and reemitted. as the energy filters through the layers of the solar interior, it passes through the -ray part of the spectrum eventually becoming light. at this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms.
a very small fraction of the suns light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the earth.
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