the source of energy能量的来源

the source of energy能量的来源
the source of energy
　　A summary of the physical and chemical nature of life must begin，not on the earth but in the sun;in fact,at the sun’s 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 hydrogen atoms clash with each other and fuse together to form 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．Thus the sun has been doing for several thousands of millions of years．
      The nuclear energy is released at the sun’s 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 remitted at slightly longer wavelengths．This radiation in its turn，is absorbed and remitted．As the energy filters through the layers of Solar inner，it passes through the X-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 sun’s light and heat is given off in such direction that，after passing unhindered through interplanetary space，it hits the earth．

能量的来源
　　生命的物理和化学性质的总结必须开始，而不是在地球上而是在阳光下;事实上，在太阳的中心。正是在这里，才能找到太阳不断涌出的能量的来源这些能量在太阳中心释放出来，亿万亿核子氢原子相互碰撞并融合在一起形成原子核。太阳的光和热的输出需要一些每秒能有6亿吨氢气在太阳下转化为氦气，太阳已经做了好几千万年。
      核能在太阳中心释放为高能量的伽马辐射，这种电磁辐射如光波和无线电波，只有非常短的波长。这种伽玛辐射被太阳内部的原子吸收，稍微汇回更长的波长，这种辐射又被吸收和消除。当能量穿过太阳内层时，它穿过光谱的X射线部分，最终变成光。在这个阶段，它已经达到了我们称太阳表面，并且可以逃逸到太空中，而不被太阳原子进一步吸收。太阳的光和热的一小部分以这样的方向发出，在通过行星际空间不受阻碍地穿过地球之后。