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
So Many "Earths" The Milky Way(银河)contains billions of Earth-sized planets that could support life. That’ s the finding of a
So Many "Earths" The Milky Way(银河)contains billions of Earth-sized planets that could support life. That’ s the finding of a
admin
2014-08-13
28
问题
So Many "Earths"
The Milky Way(银河)contains billions of Earth-sized planets that could support life. That’ s the finding of a new study. It draws on data that came from NASA’ s top planet-hunting telescope.
A mechanical failure recently put that Kepler space telescope out of service. Kepler had played a big role in creating a census of planets orbiting some 170, 000 stars. Its data have been helping astronomers predict how common planets are in our galaxy. The telescope focused on hunting planets that might have conditions similar to those on Earth.
The authors of a study, published in The Proceedings of the National Academy of Sciences, conclude that between 14 and 30 out of every 100 stars, with a mass and temperature similar to the Sun, may host a planet that could support life as we know it. Such a planet would have a diameter at least as large as Earth’ s, but no more than twice that big. The planet also would have to orbit in a star’ s habitable zone. That’ s where the surface temperature would allow any water to exist as a liquid.
The new estimate of how many planets might fit these conditions comes from studying more than 42, 000 stars and identifying suitable worlds orbiting them. The scientists used those numbers to extrapolate(推算)to the rest of the stars that the telescope could not see.
The estimate is rough, the authors admit. If applied to the solar system, it would define as habitable a zone starting as close to the Sun as Venus and running to as far away as Mars. Neither planet is Earthlike(although either might have been in the distant past). Using tighter limits, the researchers estimate that between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world. These are ones that would take 200 to 400 days to complete a yearly orbit.
Four out of every 100 sunlike stars doesn’ t sound like a big number. It would mean, however, that the Milky Way could host more than a billion Earth-sized planets with a chance for life.
The main task of the Kepler space telescope is to find out planets with similar conditions to Earth’ s.
选项
A、Right
B、Wrong
C、Not mentioned
答案
A
解析
第二段最后一句表明,开普勒太空望远镜主要寻找与地球有相似环境的星球。
转载请注明原文地址:https://kaotiyun.com/show/EHQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
TryingtoFindaPartnerOneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinterviewed,one
CoveringtheCostAllbyHimselfUniversitylifeisinnowaycheapinCanada.ItcostsPeterKemp,acomputersciencemajor
BeforegettingParkinson’sdisease,WaynelovedAfterthesurgery,Waynefelt
Accordingtothepassage,killinginsectsandbacteriapresentinfoodsbyirradiatingisnotcompletelyapprovedbytheUSgove
Sheperseveredinherideasdespiteobviousobjectionsraisedbyfriends.
CosmeticsurgeryismorepopularintheUSthananywhereelse.Theyoungwomanwasbynomeanssatisfiedwiththeeyeoperation
CosmeticsurgeryismorepopularintheUSthananywhereelse.Sometimesliposuctionpatientsmayhavetoundergomorethanone
HealthEducation1Healtheducationisthepartofhealthcarethatisconcernedwithpromotinghealthybehavior.Aperson’sbeh
Today,conventionalfinancialcontrolsarestillexercisedinsomeminorareassuchasbillingandvocationaltraining.Onethi
ThequestionraisedinParagraph1is"nomereacademicone"Inthesecondparagraph,"thethird"means
随机试题
中温盐浴校正剂的工作温度介于()之间。
A.慢性牙周炎B.牙周牙髓联合病变C.侵袭性牙周炎D.牙周脓肿E.慢性龈炎早期牙龈炎症较轻,但牙周袋深常见于
加工时用矾水擦去外皮的药材为( )。
服用时应避免接触牙齿的药物是
微分方程y’’+ay’2=0满足条件y|=0=0,y’|x=0=-1的特解是()。
某拟建铁路线路通过软硬岩层相问、地形坡度约60°的边坡坡脚,坡体中竖向裂隙发育,有倾向临空面的结构面,预测坡体发生崩塌破坏时,最可能是下列哪种形式?()
沥青混合料的松铺系数应根据试铺试压确定,摊铺过程中应随时检查(),并辅以使用的沥青混合料总量与面积校验平均厚度。
2012年7月,北京朝阳华洋分析仪器有限公司(以下简称“华洋公司”)与北京雪祥自动化系统技术有限公司(以下简称“雪祥公司”)采用合同书形式订立了一份买卖合同,双方约定由华洋公司向雪祥公司提供100台精密仪器,华洋公司于8月31日前交货,并负责将货物运至雪祥
在二级银行体制下,货币供应量等于()。
请阐述遗传学的三大定律并以此解释生物的多样性和变异性。
最新回复
(
0
)