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在晴朗的夜晚,当您登上阳台,看看天空,您就可能会看到一颗人造地球卫星,犹如一盏小信号灯在纹丝不动的星幕上穿过苍穹。这每一颗闪闪发光的圆柱体可能有数千公斤的质量(包括多翼形的太阳能电池、发送“天线”和天线板)。这些东西全部放置在数百吨重的火箭发射系统上,火箭发射系统发出火柱,在雷鸣声中将卫星送向轨道,直到通过大气层时它们才几乎完全失重。要把卫星发射到轨道上去,必须做大量的工作。然而,人们感到尤为不满的则是:难以达到宇宙中的最理想点。这些最理想点中最有意义的是所谓的地球轨道。它的高度约为三万六千公里,地球轨道面与地球赤道面一致。卫星在这条轨道上绕地球
On a clear night, when you board the balcony and look at the sky, you may see an artificial Earth satellite that acts like a small signal passing through the sky in a motionless celestial shadow. Each of these glittering cylinders can have thousands of kilos of mass (including multi-wing solar cells, transmitting “antennas” and antenna panels). All of these were placed on hundreds of tons of rocket launchers, and the rocket launcher fired a pillar of fire that sent the satellites in orbit, almost completely losing weight as they passed through the atmosphere. To launch a satellite into orbit, a great deal of work must be done. However, what people are particularly dissatisfied with is the difficulty of reaching the most ideal point in the universe. The most significant of these best points is the so-called Earth orbit. Its height is about 36,000 kilometers, and the Earth’s orbital plane is consistent with the Earth’s equatorial plane. Satellites orbited the earth on this orbit