首页
登录
职称英语
【T1】When you are in the business of sending spacecraft to other planets, it
【T1】When you are in the business of sending spacecraft to other planets, it
游客
2025-04-05
11
管理
问题
【T1】
When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep your space-probes sterile(无菌的).
NASA, America’s space agency, certainly does so. After all, you would not want bugs from one planet to contaminate another where they might possibly thrive.
But according to Curt Mileikowsky, of the Royal Institute of Technology in Stockholm, this may already have happened naturally billions of years ago when the solar system was young. For Dr. Mileikowsky has taken a century-old idea called panspermia(有生源说), and shown that it is plausible.
【T2】
Panspermia is the theory that life does not start independently on each planet that has it(assuming that other planets do). Rather, it hops from place to place, "infecting" new worlds as it goes.
Supported by experts in biology, geology and celestial mechanics, Dr. Mileikowsky argued to the American Astronomical Society meeting in Atlanta that this is not as outlandish as it sounds.
【T3】
Bungling(笨手笨脚的)space organizations apart, the only mode of travel open to microbes seems to be meteorites(流星). Most of these are small bits of junk from the asteroid(小行星)belt that have gone off course.
But some are rocks that have been flung into space from the surfaces of planets as a result of those planets having been struck by even larger bits of rock—decent-sized asteroids or comets.
【T4】
If there is life on such a planet, microscopic forms of it will probably live deep inside rocks, as they do on earth. The acceleration of lift-off would not kill something that size.
【T5】
If a rock is large enough, the heat generated as it is thrown clear will be negligible except at its surface—where, if anything, melting may even produce an airtight skin to protect any microbes deeper down from the unpleasant vacuum of space.
[br] 【T3】
选项
答案
除了凌乱的太空组织以外,流星似乎是微生物进行太空旅行的唯一方式。这些流星大多是来自小行星带并已脱离轨道的小块弃物。
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4028203.html
相关试题推荐
ItisnotdifficulttobepessimisticaboutthefutureofEuropeanbusiness.
Ithaslongbeenatenetofbusinesstheorythatthebestdecisionsaremade
Ithaslongbeenatenetofbusinesstheorythatthebestdecisionsaremade
Ithaslongbeenatenetofbusinesstheorythatthebestdecisionsaremade
Asabusinessmodel,theworldofpublishinghasalwaysbeenasomewhatslee
Asabusinessmodel,theworldofpublishinghasalwaysbeenasomewhatslee
Asabusinessmodel,theworldofpublishinghasalwaysbeenasomewhatslee
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
Sincetheearlynineties,thetrendinmostbusinesshadbeentowardon-demand,
随机试题
Thoseproblemsrequiringimmediatesolutionswillbegiven______atthemeeting
Hewent______tostudy______afterhegraduatedfromtheuniversity.A、abroad...fur
流域汇流时使用的净雨历时是指()。A.降雨历时 B.汇流历时 C.产流历
发展工业旅游能使人牢记工业文明的历史足迹,某旅游团组织开展一次“工业旅游”,根据
根据以下资料,回答116~120题。 2015年2月,我国快递业务量完成8.2
据报导,美国宇航局的“雨燕”卫星日前观测到一个距地球约131亿光年的天体。该天体
我国的矿产资源利用方式还比较粗放,在一些地方采富弃贫,一矿多开、大矿小开的现象较
委托代理的基础法律关系一般是劳务合同关系。委托代理人为被代理人的利益需要转托他人
柜式设备机架安装时,应用4只M10~M12的膨胀螺栓与地面加固,机架()应与走线
下列不属于混凝土结构构件之间、非结构构件与结构构件之间的连接要求的是()。
最新回复
(
0
)