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宇宙航行为人类飞出地球,到太空去,到别的星球去考察、去旅游、去定居,开辟了通天路,架起了星际桥,也为人类开发太空铺平了道路。人们将在那里开采矿藏,建设太空制药厂、冶金厂,盖太空旅馆,发展太空工农业生产……宇航员在宇宙空间飞行,与在地球大气层中飞行完全不同。太空中是没有重力的,任何东西都轻得可以随意飘浮,想到哪里,只要轻轻一蹬脚,就可以飞到哪里去。在太空中行走时,除了眼前的航天器和遥远的天体外,没有任何参照物作比较,分不出距离的远近和速度的快慢,远在天边的东西,可能以为近在咫尺。
Astronautics flew out of the earth for human beings, went to space, went to other places for study, traveled to settle, opened up the sky passage, set up the interstellar bridge, and paved the way for mankind to develop space. Where people will mine, build space-based pharmaceuticals, metallurgical plants, cover the space hotel and develop space industry and agriculture ... Astronauts fly in cosmic space, and fly completely in the atmosphere of the Earth. There is no gravity in space, and everything is light enough to float freely. Wherever you want to go, you can fly where you gently push a foot. When walking in space, in addition to the immediate spacecraft and faraway celestial bodies, without any reference for comparison, can not distinguish between the distance and the speed of speed, far in the sky, may think that in close proximity.