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1．太阳和太阳光太阳是地球上一切能源的源泉。阳光温室更是直接利用太阳能作为其能量的部分来源。太阳是主要由氢和氦组成的炽热气态球．是离地球最近的恒星。其直径约为1．39×105公里，距地球平均约1．495×106公里（日——地平均距离）。可以把太阳近似地看成是一个5762K温
1. Sun and Sun The sun is the source of all energy on Earth. Solar greenhouse is the direct use of solar energy as part of its energy source. The sun is a hot gaseous ball consisting mainly of hydrogen and helium. Is the closest star to Earth. It has a diameter of about 1.39 × 105 km and an average of about 1.495 × 106 km from the Earth (average daily-earth distance). Think of the sun as roughly 5762K warm