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
16
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
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/4056366.html
相关试题推荐
56.Whenyouareinthebusinessofsendingspacecrafttootherplanets,itis
56.Whenyouareinthebusinessofsendingspacecrafttootherplanets,itis
56.Whenyouareinthebusinessofsendingspacecrafttootherplanets,itis
Sincetheearlynineties,thetrendinmostbusinesseshasbeentowardon-demand
Bigbusinessesenjoycertain______thatsmalleronesdonothave.A、transactions
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Businessmen(quitegenerally)lookupon(risingprices)as(asymptom)of(pros
Asweareonthepointofsomeimportantbusiness______withthem,weshouldlike
随机试题
BenjaminFranklinwasAmerica’sfirstinternationallyfamousswimmerandswi
SpeakerA:Hereareourticketsandpassports.We’reflyingtoAmsterdamtoday.
下列有关安全玻璃的叙述,不正确的是()。A.安全玻璃包括夹丝玻璃、夹层玻璃、
关于栓剂基质聚乙二醇的叙述,错误的是A.聚合度不同,其物理性状也不同 B.遇体
在隧道监控量测作业中,各项量测作业均应持续到变形稳定后()结束。A.7~15d
A.咽喉肿痛B.血热出血C.热毒血痢D.虫蛇咬伤E.湿热淋证射干常用于治疗的病证
共用题干 Paperorplastic?Takeawalkalong
在论述教育与经济发展关系中,提出“庶→富→教”这一思路的教育家是( )A.孟子
下列哪种疾病属于免疫性溶血性贫血? A.遗传性球形细胞增多症B.海洋性贫血C
削弱爆破公害强度,在爆源上的控制措施有()。A.选择爆破参数 B.选择装
最新回复
(
0
)