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
2025-03-29
23
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://www.tihaiku.com/zcyy/4017950.html
相关试题推荐
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
Asthemanagerwasawayonabusinesstrip,Iwasaskedto______theweeklystaff
BeforehighschoolteacherKimberlyRughgotdowntobusinessatthestarto
BeforehighschoolteacherKimberlyRughgotdowntobusinessatthestarto
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
随机试题
Plantsneedgreenleavestomakefood.Aplantneedssunlightandcarbondiox
[originaltext]Whenmyinterestshiftedfromspacetothesea,Ineverexpec
计算机病毒是一个在计算机内部或系统之间进行自我繁殖和扩散的程序,其自我繁殖是指(
属于文学心理学的理论代表有()A.桑塔耶那 B.罗兰巴特 C.阿恩海姆 D
坝基处理措施中,岩土体的加固措施包括()。A.固结灌浆 B.帷幕灌浆
依据证券投资法规规定,我国封闭式基金的募集期限为()个月。A.1 B.
Intheprocess,thelightenergyconverts
患者,女,57岁。胆总管结石。入院行胆总管切开探查,T型管引流术。 若患者出院
2010年5月1日到10月31日,世博会在中国上海举行。自开幕以来,世博会的消费
下列关于详细规划的表述,错误的是()。A.法定的详细规划分为控制性详细规划
最新回复
(
0
)