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
0
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] 【T1】
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/4028201.html
相关试题推荐
ItisnotdifficulttobepessimisticaboutthefutureofEuropeanbusiness.
Bigbusinessesenjoycertain______thatsmalleronesdonothave.A、transactionsB
Ithaslongbeenatenetofbusinesstheorythatthebestdecisionsaremade
Ithaslongbeenatenetofbusinesstheorythatthebestdecisionsaremade
Asabusinessmodel,theworldofpublishinghasalwaysbeenasomewhatslee
I’d______hisreputationwithotherfarmersandbusinesspeopleinthecommunity,
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
【T1】Whenyouareinthebusinessofsendingspacecrafttootherplanets,it
Sincetheearlynineties,thetrendinmostbusinesshadbeentowardon-demand,
随机试题
RecentlyDr.Cleimanhasprovedthateveryonehadadailyenergycycle.
[originaltext]W:What’swrongwithyourphone,John?Itriedtocallyouallni
[originaltext]W:MayIhelpyou?M:Yes.Iwouldliketoapplyforoneofthese
根据防洪保护对象的重要性进行工程等别划分,当保护农田面积不小于500万亩时,工程
商业银行向客户直接提供资金支持,这属于商业银行的()。A.授信业务 B.受
进行开关柜暂态地电压局部放电带电检测的人员应了解被测开关柜的()和导致设备故
二阴煎用于A.癫病痰气郁结证 B.癫病心脾两虚证 C.狂病痰火扰神证 D.
互换协议可以用来对资产负债进行风险管理,也可以用来构造新的资产组合。( )
与天然大理石板材相比,装饰用天然花岗石板材的缺点是()。A.吸水率高 B.
某设备3年前的原始成本是5万元,目前的账面价值是2万元,现在的净残值为1万元,目
最新回复
(
0
)