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
40
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
LookattheBuildingDirectorybelow.ForQuestions6-10,decidewhichf
As______clearfromhismanners,heisateacher.A、beingB、isC、tobeD、beenB关系分
[originaltext]WhenIfirstcametotheUnitedStates,IwastoldthatIsho
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
"ExoticandEndangeredSpecies"→Whenyouhearsomeonebub
[originaltext]QuestionNo.6Itisadvisabletochooseacollegemajorbasedon
在英国君主立宪制的建立过程中,1701年颁布的嗣位法发挥了重要作用。该法规定,国
国家重力控制测量不包括()A:国家重力基本网B:国家重力控制点C:国家一等重
A.甲氧苄啶(TMP) B.环丙沙星 C.呋喃唑酮 D.四环素 E.萘啶
A.7% B.8% C.10% D.15% E.60%影响人类寿命的因素
最新回复
(
0
)