首页
登录
职称英语
If our solar system has a Hell, it’s Venus. The air is choked with foul
If our solar system has a Hell, it’s Venus. The air is choked with foul
游客
2023-09-07
15
管理
问题
If our solar system has a Hell, it’s Venus. The air is choked with foul and corrosive sulfur, heaved from ancient volcanoes and feeding acid clouds above. Although the second planet is a step farther from the sun than Mercury, a runaway greenhouse effect makes it hotter indeed. It’s the hottest of the nine plants, a toasty 900 degrees Fahrenheit of baking rocky flats from equator to poles. All this under a crushing atmospheric pressure 90 times that of where you’re sitting now. From the earthly perspective, a dead end. It must be lifeless.
"Venus has nothing," is the blunt word from planetologist Kevin Zahnle of NASA Ames Research Center in Calitfornia’s Silicon Valley. "We’ve written it off."
Yet a small group of advanced life-forms on Earth begs to differ, and theorizes that bizarre microbial ecosystems might have once populated Venus and, in fact, may be there still. Members of this loose band of researchers suggest that their colleagues have water too much on the brain, and are, in a sense, H2O chauvinists (盲目的爱国者).
"Astrobiologists are neglecting Venus due more to narrow thinking than actual knowledge of the environment, or environments, where life can thrive," says Dirk Schulze-Makuch, a geobiologist at the University of Texas at E1 Paso who recently co-authored a Venus-boosting paper in Astrobiology with colleague Louis Irwin.
The bias against life on Venus is partly rooted in our own biology. Human experience instructs that liquid water, preferably lot of it, is essential for life. In search for extraterrestrial life, we obsess over small rivers in Mars’ surface apparently carved by ancient gushes of water, and delight in hints of permafrost (永久冻结带) just underneath its surface. (By comparison, Venus isn’t even that interesting to look at: A boring cue ball (台球的白色母球) for backyard astronomers, its clouds reflects 75% of visible light.) Attention and then funding follow the water: Three more landers will depart for Mars this spring, and serious plans for sample-return missions hover in the midterm future.
"If you have limited resources, you base exploration on what you know," says Arizona State University planetary geologist Ronal Greeley. It’s like losing your keys on the way home at night: The first place you look is under the streetlights not because they’re more likely to be there, but because if they are, you’ll spot them. For astrobiologists, the streetlights are the spectral (光谱的)lines for water, and they’ve spotted that potential on Mars, Jupiter’s moon Europa, even Neptune’s moon Triton. Not on the baking rocky flats of Venus. [br] Venus is the hottest of all the nine planets in the solar system because______.
选项
A、it is not so close to the Sun as Mercury
B、many volcanoes spread the whole planet
C、it is covered by a thick layer of cloud
D、greenhouse effect is uncontrollable on it
答案
D
解析
从文中所述可以推断,金星比其他行星都热,是因为温室效应肆虐(runaway),因此正确答案应为D。
转载请注明原文地址:https://tihaiku.com/zcyy/2993148.html
相关试题推荐
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
IfoursolarsystemhasaHell,it’sVenus.Theairischokedwithfoul
IfoursolarsystemhasaHell,it’sVenus.Theairischokedwithfoul
IfoursolarsystemhasaHell,it’sVenus.Theairischokedwithfoul
Scienceisthesystematic_________ofknowledgeusingnatureitselforlaborato
Thereformineconomicsystemwillhelp______anddevelopthesocialisteconomic
随机试题
Theysaidtheyexpectedthatthemeetingwould_____________(有显著影响)thefutureof
Morethanhalftheadultpopulationclaimstobesufferingfromit.Itmakes
证券市场线描述的是()。A.证券的预期收益率与其总风险的关系 B.市场资
药品不良反应实行A.逐级、快速报告制度,必要时可以越级报告 B.逐级报告制
一般情况下,同一路段应先施工的路基地面排水设施是( )。 A、边沟 B、
下面四个图形中,只有一个是由上面的四个图形拼合(只能通过上、下、左、右平移)而成
以下关于经济周期理论,属于外因论的是()。A、投资过度理论 B、创新理论
要使地下管线合理埋设、各得其所,必须要有一个统一的规划,应把管线铺设与房屋、道路
授信集中度限额可以按不同维度进行设定,其中()不是其最常用的组合限额设定维度。
符合相关产业发展规划是项目决策分析的基础和前提,这体现了产业发展规划的()特点。
最新回复
(
0
)