改变坐地观天的局面,实现嫦娥奔月、上穹碧落的梦想,把人类活动范围扩展到地球稠密大气层以上的外层空间,更好地认识太阳系环境和观测宇宙深空,利用太空极高真空、微重力、超低温、无菌、无振和强辐射等特殊条件从事各种试验和研究活动,设法开发极其丰富的空间资源,是人类文明史上的空前壮举和划时代的里程碑,也是科学技术在20世纪下半叶取得的重大成就和创造的恒久辉煌。这一切都统属和归功于载人航天。飞向太空要靠载人航天器,但仅此是不够的。因为宇航员驾驶和乘坐载人航天器在太空从事各种探测、试验、研究、军事和生产的往返飞行活动,在升空时需要从发射场发射运载火箭提供推力,在太空轨道上运行时需要地面测控网监控,返回地面时又需要回收设施的配合,故而载人航天是由航天器、运载火箭、发射 Change the situation of sitting on the earth and watch the sky, realize the dream of going to the moon, ascend to the sky and blue sky, extend human activities to the outer space above Earth’s dense atmosphere, better understand the environment of the solar system and observe deep space in the universe, , Microgravity, ultra-low temperature, aseptic, non-vibration and strong radiation and other special conditions to engage in various experimental and research activities, to explore the development of extremely rich space resources is an unprecedented feat in human civilization history and epoch-making milestone, but also science and technology in 20 The great achievements made in the second half of the century and the permanent glory created. All this is due to and thanks to manned space. Flying to space depends on manned spacecraft, but this alone is not enough. Because astronauts commute and launch various spacecraft engaged in various types of exploration, test, research, military and production operations while driving or flying manned spacecraft, it is necessary to launch the launch vehicle from the launch site at liftoff to provide thrust and to operate on space orbit Ground monitoring and control network monitoring, return to the ground and the need for recycling facilities, so manned spacecraft from spacecraft, launch vehicles, launched