WhenGeoffMarcywas14,hisparentsboughthimatelescope.Every...
问题详情:
When Geoff Marcy was 14, his parents bought him a telescope. Every night, he would go onto the roof outside his window to see the wonders of the sky.
“What excited me most was whether there were planets in other solar systems where life might exist,” he says. “I decided to try to find planets orbiting (沿…轨道运行) other stars like our Sun.”
And he did. “My fellow researcher, Paul Butler, and I found our first planet in 1995,” Dr. Marcy says. “We worked for ten years without finding anything! But we stuck with it, and our patience paid off. ”
Since then, the two scientists have discovered 65 of the more than 100 planets found orbiting other stars. Dr. Marcy and Dr. Butler also spotted the first “family” of three planets. In June 2002 they announced another discovery: a Jupiter-like (像木星一样的) planet orbiting star 55 Cancri.
At first, the two researchers found only planets that orbit close to stars. Recently, the scientists found planets farther out. The planet orbiting 55 Cancri is a major breakthrough: it is the first sighting of a large gas planet about the same distance from the star as Jupiter is from the Sun.
Why is this important? Scientists think that life on Earth may exist because of two special features in our solar system. The first is Jupiter.
“Because it’s so big, Jupiter pulls comets and asteroids (小行星), or they all come and hit the Earth.” Dr. Marcy explains. “Without Jupiter, life on Earth would likely have been destroyed.”
A second feature is that Earth is a rocky planet where liquid water, which is necessary for life, can exist. Unlike gas planets, rocky planets like Earth have surfaces where water can gather in pools and seas, which may support life. A huge space exists between the Jupiter-like planet and two other planets that lie close to 55 Cancri. Is there an Earth-like planet in the space, too small for us to notice? If so, says Dr. Marcy, “We would have two striking similarities to our solar system: a Jupiter-like planet and an Earth-like planet. And there may be life! ”
24. What can we learn about Dr. Marcy from the passage?
A. He is fond of watching Jupiter.
B. He is from a scientist family.
C. He dislikes working with Paul Butler.
D. He is interested in finding life in outer space.
25. Which of the following is true of the recent discovery?
A. The planet is not as protective as Jupiter.
B. The planet is close to star 55 Cancri.
C. The planet proves to be a gas planet.
D. The planet is as large as Jupiter.
26. Dr. Marcy thinks that life may exist in the 55 Cancri system because ________.
A. he has found the system similar to the solar system
B. he has discovered an Earth-like planet there
C. he has discovered a rocky planet there
D. he has found signs of life in the system
27. “But we stuck with it” (in Paragraph 3) means ________.
A. they felt discouraged B. they carried on with it
C. they failed in their attempt D. they made some progress
【回答】
DCAB
知识点:人物传记 故事类阅读
题型:阅读理解
-
设复数(是虚数单位),则复数的虚部为( )A. B. C. ...
问题详情:设复数(是虚数单位),则复数的虚部为( )A. B. C. D.【回答】B知识点:数系的扩充与复数的引入题型:选择题...
-
蜡烛燃烧刚熄灭时产生的白*是什么?提出问题:蜡烛刚熄灭时,总会有一缕白*冒出,它的成分是什么呢?猜想与假设:A...
问题详情:蜡烛燃烧刚熄灭时产生的白*是什么?提出问题:蜡烛刚熄灭时,总会有一缕白*冒出,它的成分是什么呢?猜想与假设:A.白*是燃烧时生成的二氧化碳;B.白*是燃烧时生成的水蒸气;C.白*是石蜡蒸气凝成的石蜡固体小颗粒进行实验:⑴吹灭蜡烛,立即用一个蘸有澄清石灰水的烧杯罩住白...
-
根据句意及首字母,写出单词,使句子意思完整1.Mym________birthdayisDecember13t...
问题详情:根据句意及首字母,写出单词,使句子意思完整1.Mym________birthdayisDecember13th.2.Ilikep________music.3.Shew________toplaybaseball.4.Thelittleboywantssomec________.5.MissWangiso________musicteacher.6.Doyouwanttoplaywiththedogn________?7.Let'sp_...
-
下列与实验相关的叙述正确的是 A.稀释浓硫*时,应将蒸馏水沿烧杯内壁缓慢地注入浓硫*中B.配制溶液时,若加水...
问题详情:下列与实验相关的叙述正确的是 A.稀释浓硫*时,应将蒸馏水沿烧杯内壁缓慢地注入浓硫*中B.配制溶液时,若加水超过容量瓶刻度,应用胶头滴管将多余溶液吸出C.配制1mol·L-1300mLNaCl溶液可以选择一个50mL的容量瓶和一个250mL的容量瓶D.可以用右图装置进行*气的...
相关文章
- Althoughpeopleeverywhereseemtoenjoydrinkingcoffee,theyd...
- It'sinterestingtoseehowpeoplemakeuseofthetimetheyspendo...
- ThewordsfromPage1toPage3areveryclear.Buttheonesonthe
- 任务型阅读。BobSmithsayshenevergaveupthesearchforhisbeloved19...
- 完形填空Americanpeoplehavethehabitofsaying“Thankyou”whensom...
- Whendifficultpeopleexpressthemselvesorally,theygeneral...
- Theoddnessoflifeinspaceneverquitegoesaway.Herearesomeex...
- Somecouplesspendeverywakingminutetogether.Othersfillthe...
- Theresultoftheexperimentwasverygood,
- Ifoverweightpeopleeatlessandtakemoreexercise,they’llso...