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“哪个方向是上?”这个问题对于任何一个人身处地球之上的人来说,都太简单了。不过,对于那些身处外太空宇宙空间站的航天员来说,这可就是个让人挠头的问题了。因为当物体处于失重状态时,“立正”或是“把书放下”没什么意义。在地球上,我们由于重力的缘故才有了上、下的方向。在宇宙空间站的科学家将这种失重状态称为徽重力环境,科学家计划利用这种环境制造高纯度结晶体、特种合金等。微重力环境也带来一些麻烦,比如,因为没有重力把脚“压迫”在地板上而使行走变得艰难,咖啡也很难“老老实实”地呆在杯子里。美国和俄罗斯的航天员找出了一个解决这种问题的办法——在1998年,他们开始在地球上空400千米的太空中建造一个巨大的国际空间站。当这座空间站建造完成时,空间站看起来就像下面这个样子。
“Which direction is on? ” This question is too simple for anyone who lives on top of the earth. However, this can be a head-scratching issue for astronauts in outer space missions. Because when the object is in a state of weightlessness, it does not make sense to either “stand” or “put the book down.” On Earth, we have the upper and lower directions due to gravity. Scientists at the space station called this state of weightlessness the emblem of gravity environment, scientists plan to use this environment to create high purity crystals, special alloys and so on. The micro-gravity environment also poses some problems, for example, making it difficult to walk on the floor without gravity due to “crushing” the feet. It is also difficult for coffee to remain “honestly” in the glass. The astronauts of the United States and Russia have figured out a solution to the problem - in 1998 they started to build a huge space station in space 400 kilometers above Earth. When the space station is built, the space station looks like this.