After spending years searching for a planet with life, scien
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/08/24 21:23:20
![]() The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from Earth. That is about 194 trillion(万亿)kilometres -500 million times farther away from us than the moon. A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can’t live that long, but robotic explorers could make the job easier. However, our fastest spacecraft don’t come anywhere near that one-tenth light-speed mark. At present, scientists don’t know what the surface might be like on Gliese 581g. What they know is that the planet is at the sight distance from its star to have liquid water. It’s also at the right distance to have an atmosphere that could protect the water if it is on the surface. Although spacecraft won’t be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes(望远镜)towards the planet and search for radiation(放射). By studying the radiation, scientists would find out about the chemicals(化学物质)around the planet and discover it Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea if the planet has life or not. But it’ll probably be many years before we can do this properly. People have been arguing about whether there is alien life on Gliese 581g. Any discussion about alien life is just guessing at this point, according to its discoverers. 小题1: What did scientists find in September 2010?
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小题1:A
小题1:A
小题1:C
小题1:A
【主旨大意】科学家在2010年9月发现了一个带有生命迹象的球体,然后介绍了它与地球的距离以及寻找生命的方法。
小题1:细节理解。第一段第一句:科学家发现了一颗存在生命的行星。
小题1:细节考查。从第四段可知:the planet is at the right distance from its star.
小题1:整体理解。本段主要介绍寻找Gliese 581g上面生命的方法。
小题1:整体理解。Gliese 581g是一个充满生命的球体。
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