首页
登录
职称英语
56. When you are in the business of sending spacecraft to other planets, it is
56. When you are in the business of sending spacecraft to other planets, it is
游客
2025-04-27
37
管理
问题
56.
When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can m keep your space-probes sterile (无菌的).
NASA, America’s space agency, certainly does so. After all, you would not want hugs 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 sys- tem was young. For Dr Mileikowsky has taken a century-old idea called panspermia (有生源说), and shown that it is plausible.
57.
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.
58.
Bungling (笨手笨脚) 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.
59.
If there is life on such a planet, microscopic forms of it will probably live deep in- side rocks, as they do on earth. The acceleration of lift-off would not kill something that size.
60.
If a rock is large enough, the heat generated as it is thrown clear will be negligible except at its surface--where, ii anything, melting may even produce an airtight skin to protect any microbes deeper down from the unpleasant vacuum of space.
[br]
选项
答案
如果你从事的是将宇宙飞船发射到其他行星上的行当,那你最好想方设法使你的航天探测器保持无菌状态。
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4056364.html
相关试题推荐
56.Whenyouareinthebusinessofsendingspacecrafttootherplanets,itis
56.Whenyouareinthebusinessofsendingspacecrafttootherplanets,itis
Bigbusinessesenjoycertain______thatsmalleronesdonothave.A、transactions
Everydaydecisionsaremadethatinfluenceourlivesorbusinesses.Withme
Everydaydecisionsaremadethatinfluenceourlivesorbusinesses.Withme
Everydaydecisionsaremadethatinfluenceourlivesorbusinesses.Withme
Everydaydecisionsaremadethatinfluenceourlivesorbusinesses.Withme
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Asweareonthepointofsomeimportantbusiness______withthem,weshouldlike
随机试题
【T1】______areactually【T2】______.Whiletheyare,perhaps,【T3】______tome
[originaltext]W:BeingHispanic,whatadvantagesanddisadvantageshaveyoufac
Thecaseforcollegehasbeenacceptedwithoutquestionformorethanagene
决定一种商品供给的主要因素有()。A、生产技术水平B、生产成本C、相关商品的价格水平D、该种商品的价格A,B,C,D决定一种商品供给的主要因素有
我国传统民居土楼主要分布在哪些地区?( )A.青藏高原、西康、内蒙古 B.广
根据现行《公路工程质量检验评定标准》的规定,()不是沥青贯入式面层的实测项
A.肛裂 B.内痔脱垂 C.肛瘘 D.直肠癌 E.直肠息肉男性,58岁,
一个正方形旋转360°后,其旋转轨迹不可能形成的图形是()。 A.如上图所示
可以用以下()概率分布来描述股票(或资产组合)每日收益率的分布。A.正态分布
2020年某居民企业收入总额为3000万元(其中免税收入400万元,符
最新回复
(
0
)