当宇宙飞船的返回舱或航天飞机返回地面时 ,由于地球引力使之不断加速 ,进入大气层时 ,其加速度可达几个g ,与空气的剧烈摩擦其外壳温度可达数千度 ,比熔融的钢水温度还要高得多。你看我们的神舟 5号在返回时 ,不但仪器仪表完好无损 ,宇航员杨利伟也是毫发未伤。飞船是怎样实现 When the spacecraft’s return capsule or space shuttle returns to the ground, due to the Earth’s gravity to make it continue to accelerate, into the atmosphere, the acceleration of up to several g, and the intense friction of the air its shell temperature up to several thousand degrees, than the melting The temperature of molten steel is much higher. When you look back on our Shenzhou 5, not only are the instruments and instruments intact, but the astronaut Yang Liwei is unimpaired. How to achieve spacecraft