首页
登录
职称英语
An international team of astronomers has discovered 11 new planets outside th
An international team of astronomers has discovered 11 new planets outside th
游客
2024-12-02
20
管理
问题
An international team of astronomers has discovered 11 new planets outside the solar system, raising fresh speculation about the possibility of life in outer space.
Astrophysicists from the Geneva Observatory and the European Southern Observatory (ESO) headquartered in Germany, were involved in the detections announced earlier this month.
Since the first extrasolar planet was found orbitting around the star 51 Pegasi in 1995, astronomers have pinpointed between 60 and 70 such heavenly bodies across the universe.
Each discovery raises new questions about the formation and behaviour of planets among scientists raised on the assumption that distant planets orbitted stars the way the Earth and other planets in the solar system revolve around the sun.
But astronomers are now detecting planets of unexpected size in areas where they least expected to find them. Last year, they found a handful of new planets similar in size to small stars and others that moved freely in space without orbitting any star.
Some of the 11 planets whose discovery has just been disclosed have special characteristics, according to the ESO.
One of them is a gas giant at least 5. 6 times as massive as Jupiter, the largest planet in the solar system. It was detected around a star known under the scientific designation HD28185.
Many of the previously discovered extrasolar planets of similar size were found close to stars or revolved around them in eccentric orbits. But the new one has an almost circular orbit similar to that of our own planet.
Its orbital period of 385 days is also similar to the year taken by the Earth to travel around the sun. Its average distance from its central star is 150. 6 million kilometres, almost the same as the 149. 6 million kilometres between our planet and the sun.
This would place the new planet in a so-called hospitable zonewhere temperatures similar to those on Earth are possible.
Although such gas giants are not considered favorable to the development of life forms, they could have moons around them where life might be theoretically possible.
Another new discovery is a two-planet system around the star HD82943 where the orbit of one of the planets is twice as long as that of the other. Such commensurable orbits also exist in the solar system.
A further two-planet system was detected near the star HD74156, with one of the planets similar to the mass of Jupiter and the other having a far greater mass.
Another new discovery was a giant planet 3. 4 times the mass of Jupiter that approached to within 5 million kilometres of the star HD80606. At its furthest point it was 127 million kilometres away.
In contrast Mercury, the planet nearest the sun, is 46 million kilometres away at its closest point.
None of the extrasolar planets has been seen with telescopes. They are detected indirectly by the effects of gravity on the motions of their mother star.
Calculations of the changes in motion of these stars allow astronomers to draw conclusions on the orbit of the planets, their mass and their distance from the central stars.
A major problem affecting observation using current telescope technology is that light shining from the stars tends drown all weaker sources of light in the vicinity. [br] It can be inferred from the text that______.
选项
A、discoveries of new planets set scientists thinking
B、extrasolar planets exist in the universe
C、solar system should be re-examined by mankind
D、new discovery depends on new theory
答案
A
解析
选A。文章讲述了发现新行星给科学家带来的思考。
转载请注明原文地址:https://tihaiku.com/zcyy/3869755.html
相关试题推荐
Aninternationalteamofastronomershasdiscovered11newplanetsoutsideth
Aninternationalteamofastronomershasdiscovered11newplanetsoutsideth
Aninternationalteamofastronomershasdiscovered11newplanetsoutsideth
TheIELTSExamIELTS:InternationalEnglishLanguage
TheIELTSExamIELTS:InternationalEnglishLanguage
TheIELTSExamIELTS:InternationalEnglishLanguage
TheIELTSExamIELTS:InternationalEnglishLanguage
TheIELTSExamIELTS:InternationalEnglishLanguage
TheAmericanspaceshuttleEndeavourhasliftedofffortheInternationalSp
GainingCrossculturalandInternationalPerspectives:ABookReview
随机试题
Althoughwomenclustertohimlikemothsaroundaflame,heisnone______happie
Theprimarypurposeofthepassageisto______[br]Thepassagesuggestswhicho
NarratorListentoaconversationbetweenAnaandhertutorabouthercoursesse
Theaveragenumberofwomenineachgroupis______.[br][originaltext]Be
美国期货市场由商品期货交易委员会(CFTC)监管,并由全国期货协会(NFA)进行自律性监管。()A、正确B、错误A美国期货市场由商品期货交
某内部审计师在审计过程中发现被审计单位可能存在违法行为,但由于没有证据,他没有向
有效市场理论,根据证券价格对市场信息的反映程度,将有效市场划分为()。A.弱式
下列哪条依据诊断慢性细菌性前列腺炎最有价值A.膀胱刺激症状 B.尿中多次培养出
在现阶段,居民理财的两大主要方式是()A.商铺与实业投资 B.外汇投资与股权
根据下列资料回答问题。 以下为某省的人口失业率图表。其中,黑色部分表示该省全省
最新回复
(
0
)