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新概念英语第三册课文内容55 From the earth： Greetings

2024-08-23 08:10:00来源：网络

　　新概念英语第三册课文内容55 From the earth： Greetings已发布，欢迎大家查看。新概念英语第三册内容主要针对的是基础比较薄弱的同学，为了方便同学们可以更好地巩固英语基础，小编还整理了新概念英语第三册课文、新概念英语第三册音频相关内容，便于同学们一起学习!

　　Which life forms are most likely to develop on a distant planet?

　　Recent developments in astronomy have made it possible to detect planets in

　　our own Milky Way and in other galaxies. This is a major achievement because, in

　　relative terms, planets are very small and do not emit light. Finding planets is

　　proving hard enough, but finding life on them will prove infinitely more

　　difficult. The first question to answer is whether a planet can actually support

　　life. In our own solar system, for example, Venus is far too hot and Mars is far

　　too cold to support life. Only the Earth provides ideal conditions, and even

　　here it has taken more than 4 billion years for plant and animal life to

　　evolve.

　　Whether a planet can support life depends on the size and brightness of its

　　star, that is its 'sun'. Imagine a star up to 20 times larger, brighter and

　　hotter than our own sun. A planet would have to be a very long way from it to be

　　capable of supporting life. Alternatively, if the star were small, the

　　life-supporting planet would have to have a close orbit round it and also

　　provide the perfect conditions for life forms to develop. But how would we find

　　such a planet? At present, there is no telescope in existence that is capable of

　　detecting the presence of life. The development of such a telescope will be one

　　of the great astronomical projects of the 21st century.

　　It is impossible to look for life on another planet using earth-based

　　telescopes. Our own warm atmosphere and the heat generated by the telescope

　　would make it impossible to detect objects as small as planets. Even a telescope

　　in orbit round the earth, like the very successful Hubble telescope, would not

　　be suitable because of the dust particles in our solar system. A telescope would

　　have to be as far away as the planet Jupiter to look for life in outer space,

　　because the dust becomes thinner the further we travel towards the outer edges

　　of our own solar system. Once we detected a planet, we would have to find a way

　　of blotting out the light from its star, so that we would be able to 'see' the

　　planet properly and analyze its atmosphere. In the first instance, we would be

　　looking for plant life, rather than 'little green men'. The life forms most

　　likely to develop on a planet would be bacteria. It is bacteria that have

　　generated the oxygen we breathe on earth. For most of the earth's history they

　　have been the only form of life on our planet. As Earth-dwellers, we always

　　cherish the hope that we will be visited by little green men and that we will be

　　able to communicate with them. But this hope is always in the realms of science

　　fiction. If we were able to discover lowly forms of life like bacteria on

　　another planet, it would completely change our view of ourselves. As Daniel

　　Goldin of NASA observed, 'Finding life elsewhere would change everything. No

　　human endeavour or thought would be unchanged by it.'

　　New words and expressions 生词与短语

　　astronomy

　　n. 天文学

　　relative

　　adj. 相对的

　　infinitely

　　adv. 无限地，无穷地

　　solar

　　adj. 太阳系的

　　Venus

　　n. 金星

　　Mars

　　n. 火星

　　orbit

　　n. 运行轨道

　　astronomical

　　adj. 天文学的

　　generate

　　v. 产生

　　particle

　　n. 微粒，粒子

　　Jupiter

　　n. 木星

　　blot

　　v. 遮暗

　　analyse

　　v. 分析

　　bacteria

　　n. 细菌

　　oxygen

　　n. 氧气

　　realm

　　n. 领域

　　endeavour

　　v. 努力

　　以上就是为大家整理的“新概念英语第三册课文内容55 From the earth： Greetings”，希望可以帮助大家更好地学习新概念英语第三册内容，更多内容敬请关注!


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