太空旅行的危害ppt
以《太空旅游的利弊》为题的英语作文
Space travel Space travel is ideal for people to travel in space. Space travel gives people a hitherto unknown experience. Th
以《太空旅游的利弊》为题的英语作文
Space travel Space travel is ideal for people to travel in space. Space travel gives people a hitherto unknown experience. The most novel is that you can enjoy the beautiful scenery of space. At the same time you also can enjoy the taste of weightlessness. In the near future, People may go to space travel. Advantages of space travel is as follows.1.space travel provides a new space for human living 2. To provide people with new energy3. To help people better understand the universe4. Space research is good for other areasAlthough Space travel is beautiful It has disadvantages.At first it costs too much. Secondly the idea of Human live on other planets is unrealistic.At last Space travel is dangerous.As for me, all these problems will certainly be solved Step by step. A much better and brighter future waits for us.太空旅行是基于人们遨游太空的理想, 太空旅行给人一种前所未有的体验, 最新奇的是你可以观赏太空美丽的风光,同时还可以享受失重的味道。
在不久的将来,人们可能到太空去旅行。
太空旅行的优势如下:1、太空旅行提供人类居住的新场所。
2、给人类提供新能源3、帮助人们更好的了解宇宙4、太空研究对其他领域有好处太空旅行虽然美好,但是它有优势也有劣势。
首先它花费太多,其次人类住在其他行星上的想法不切实际,最后太空旅游有危险。
就我看来,所有这些问题都肯定会逐步得到解决,一个更加美好更加灿烂的未来在等待着我们。
太空旅行和探险有哪些最大的危险和问题
吃饭、喝水对于生活在地球上的人来说,是一件再平常不过的事了,但在失重环境下的太空生活,宇航员的饮食就变得十分复杂而且特别奇妙。
可以说,宇航员的营养需求、食品制备、供给和他们的进食方式等都有一定的特殊性,与他们在地面生活的饮食有着很大的不同。
航天食品从本质上讲与地面普通食品是一样的,都是为人体提供能量和营养。
但为了节省飞船的空间和发射时的有效载荷,宇航员携带的航天食品应尽可能重量轻、体积小。
如营养好的干化饼干和干化香肠,吃时用水泡一下,即可恢复到与新鲜食品相近的味道。
航天食品除了要能经受住航天特殊环境因素的影响,如冲击、振动、加速度等的考验而不失效外,还必须针对宇航员在失重条件下生理改变的指数对膳食的营养素作适当调整,如肌肉萎缩就要求食品必须提供充足的优质蛋白质;骨质丢失则要求食品提供充足的钙以及适宜的钙磷比例和维生素等。
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太空旅行对人体影响大吗?
北京10月31日消息,乘坐太空飞船长时间“旅行”,对宇航员的影响远非此前所想。
据《科学美国人》近日报道,美国国家航空航天局(NASA)的“双胞胎研究”项目的初步结果显示,太空旅行强烈地影响着基因的表达方式。
展开全部宇航员会在进入太空后发生肌肉萎缩、骨密度降低或视觉恶化等身体变化,NASA希望更好地了解太空旅行对宇航员的所有生理和心理影响,为登陆火星或更遥远目的地的飞行任务做好准备。
2015年3月到2016年3月,宇航员斯考特·凯利在空间站度过了将近一年时间,其孪生兄弟马克·凯利在地球上作为对照组,共同接受一项衡量太空旅行对人体引起的变化研究。
“双胞胎研究”项目的主要研究人员、康奈尔大学医学院的克里斯·梅森在一份声明中说:“我们从基因表达中看到的最令人兴奋的事情是,一旦人体进入太空,会出现各种变化,像烟花一样在 爆炸 ,通过这项研究,已经看到成千上万的基因如何被改变了打开和关闭方式。
”据介绍,一旦宇航员进入太空,就会发生这种情况,其中一些变化在宇航员返回地球时还会持续下去。
举例来说,梅森及其研究小组发现,斯考特的基因甲基化有所增加,该过程通常会抑制所涉及到的基因的激活过程。
研究人员仍在更广泛的、包括10项单独调查在内的“双胞胎研究”中,继续评估这种变化。
NASA官员表示,明年将公布最终结果。
“这项研究代表了目前有关人类生物学最全面的观点,”梅森说,“为了解太空旅行的风险、潜在保护和修复遗传变化提供了路径。
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帮忙写篇英语作文“普通人去太空旅游”利:提供人类居住新所,提...
The Advantages and disadvantages of Space TravelThere are several advantages of space travel.First of all,it could provide man with new places to live in and new sources of energy.In addition,space travel helps people understand the universe better.Also space travel research does good to other research fields.However,space travel also has some disadvantages.It uses up too much money which could be spent in other ways.What's more,the idea of man living on other planets is unrealistic.Space travel could be dangerous,too.In a word,though there are the disadvantages,I think space travel is a good thing.It is important for man to explore and learn about the universe.
关于太空旅游的英语作文
Nowadays space travel has no longer an impossible assumption for human being, due to continuing updating technology, people are currently designing taking trip to this unfamiliar area. There appears several supporting ideas of space tourism, asserting that it would benefit human futher development; however, the disadvantages lie there, which against that the negative impacts of space tourism cover its contribution. This essay, therefore intend to discuss both side of such arguement. At the beginning, sapce trip insure the oppertunities for human beings to discover their future residence. It is possible to identify or even locate new planets that are similar to earth and suitable for living. Secondly new type of resource could be explored, which could reduce the earth resource presure by a large scale. Thirdly further understanding would be gained by space travellers after an sufficient space experiment. Next but not last, space tourism might also be meaningful to other aspects of society, for instance the environment of earth woudl be guarantee by future new source of eco-energies. On the other hand, the influences of space are put into debate. Most taxpayers complain that new type of travel might empty their wallet and lead to more expensive lives. Groups of people worry that it is not rational and acceptable to be survive on planets other than earth because of the severe natural environment. Some of opponents even warning that space travel could confront travelers with dangours. Personally, ......(这里用来写你自己的观点,你支持哪一方)
想去火星,先要了解太空旅行会对人体造成哪些伤害
Travel A succession of beautiful scenery makes one feel delighted. A long stay in the same surroundings to make everything the same. Routine work often makes one feel bored But if you take a trip or a long journey on your holidays to some scenic spots or historic sites, that will make great difference. Travel can widen one's knowledge. The farther you go, the more you will learn about different politics, economics, customs as well as geography. If you travel the whole world some day, you will fully understand the globe on which we live. However, too much travel causes tiredness. You get on a bus or a taxi, you travel on the train or in a plane, being patient with the hours needed on your mute from one place to another, that will make you exhausted after a while.
人类能长时间的进行太空旅行吗
就现在的科技水平来看是不能的首先,太空是处于失重状态的,人们到达太空之后,就会持续处于失重状态之下,不会感觉到任何的重力作用。
在这种情况下,人的骨骼和肌肉会因为没有重力而退化甚至萎缩。
因为在太空中想去任何一个地方都只需要漂浮过去,你只要掌控好方向即可。
在太空生活的时间中,你的手部会因为要搬运各种东西而得到锻炼,不得不说手部将是你在太空中运用最多的身体部位。
而腿几乎失去了原有的作用,变得可有可无。
所以腿部的锻炼就显得尤为重要。
这就是为什么航天员除了完成任务之外,还会在太空舱内进行腿部的运动锻炼,这样才能防止腿部肌肉的萎缩。
而除了腿部的问题,失重也会减缓消化道的功能,从而引起进餐问题的发生。
在失重状态下,你的消化系统会短暂的停摆,你不能吃也不能喝,直到你重新开始消化为止。
这起码要耽误几个小时,严重时甚至几天的时间。
所以这意味着到了太空后,你可能首先要面对的就是不能立即享受你带来的美食,糟糕的时候也许可能几天后才可以开始吃东西。
而除了失重这个问题,你还会面临着太空辐射的威胁,并且这两个危险因素有时会结合起来对人体造成危害。
在太空中,人体的免疫系统并不会像在地球上一样起到强大的作用,而偏偏细菌在太空的繁殖速度将会是在地球上的50倍,病毒也会在辐射的条件下产生变异,这样我们平常能够承受的许多细菌和病毒在太空中就显得十分危险了。
而以上所说的一切,都是人类在太空中短时间可能会出现的问题,那么长时间的旅行更不用说了。
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