首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
56. When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can m keep yo
56. When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can m keep yo
admin
2012-10-23
32
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.
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://kaotiyun.com/show/mL9O777K
0
考博英语
相关试题推荐
Ofthegreatvarietyofopinionsconcerning"marriageformoney",thefollowingthreeareimportantwithreferencetothedevel
Ofthegreatvarietyofopinionsconcerning"marriageformoney",thefollowingthreeareimportantwithreferencetothedevel
IhaveobservedthattheAmericansshowalessdecidedtasteforgeneralideasthantheFrench.Thisisespeciallytrueinpolit
Theidealcompanionmachine—thecomputer—wouldnotonlylook,feel,andsoundfriendlybutwouldalsobeprogrammedtobehavein
Theidealcompanionmachine—thecomputer—wouldnotonlylook,feel,andsoundfriendlybutwouldalsobeprogrammedtobehavein
Howiscommunicationactuallyachieved?Itdepends,ofcourse,eitheronacommonlanguageoronknownconventions,oratleast
ThebiggestcomputercompanyinSiliconValleyhaslaidoffhundredsofpeopleduringthelastfewyears.
Nowthejuries,andultimatelythesocietytheyspeakfor,havetofindsomewaytoexpress______atthebrutalitythatwomena
Justiceinsocietymustincludebothafairtrialtotheaccusedandtheselectionofanappropriatepunishmentforthoseproven
随机试题
________,宛转蛾眉马前死。(白居易《长恨歌》)
防止产后出血,下列哪项措施是错误的
下列不属于直接引入法造影的是
在中国境外投资的技术方案财务基准收益率的测定,应首先考虑的因素是()。
下列有关证券业务的专业人员范围的说法,正确的有()。Ⅰ.证券公司中从事自营、经纪、承销、投资咨询、受托投资管理等业务的专业人员Ⅱ.除相关部门管理人员外,基金销售机构中从事基金宣传、推销、咨询等业务的专业人员Ⅲ.证券投资咨询机构中从事证券
下列关于合并财务报表附注的表述中,正确的有()。
采购人、采购代理机构及其工作人员属于国家机关工作人员的,依法给予行政处分的违法情形包括()。
淮扬菜的代表名菜有()。
20世纪纪匈牙利有一位教育家创立了()
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律:
最新回复
(
0
)