英语听力：自然百科 穿越银河系的旅行 Through Milky Way—11

 Once they’ve caught the light of a dying star with their state of our telescopes. The detective work can begin.

 

We collect that light and we analyze¹ it in great detail in order to determine what’s going on, what’s the chemical makeup² of the star, what’s the pressure inside, what’s the temperature, what kind of nuclear reactions are going on, how does the star explore. All these things we figured out through the analysis of light.

 

In doing so, astronomers³ have discovered that it’s only star with a huge mass that go out with a bang.

 

A massive star has a very interesting and vigorous life. Initially⁴ it fuses hydrogen to form helium and that produces energy that makes the star shine, then the ashes of that reaction the helium fuse together to form carbon and oxygen, releasing yet more energy. Then the carbon and oxygen can fuse into still heavier elements, magnesium⁵, sodium⁶, and neon, and things like that and then silicon⁷ and sulfur⁸, and finally iron.

 

When it starts to make iron, the giant star is doomed⁹. In the core, there is a fierce battle. Energy is pushing outwards¹⁰, holding it up, while gravity wants to crash it inwards. The battle continues as the star makes heavier and heavier elements, producing energy, fending¹¹ off total collapse¹². But once it stops to form iron, the battle is lost.

 

Fusion¹³ of iron, nuclear iron to heavier things, does not release energy; it absorbs energy. So an iron core builds up, but finally it becomes so massive, the gravity wins, the iron core collapses¹⁴, in last second, the out layer collapse inward then rebound¹⁵ and get blown to smithereens.

1 analyze   

vt.分析，解析 (=analyse)

参考例句：

• We should analyze the cause and effect of this event.我们应该分析这场事变的因果。
• The teacher tried to analyze the cause of our failure.老师设法分析我们失败的原因。

2 makeup   

n.组织；性格；化装品

参考例句：

• Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
• Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗？

3 astronomers   

n.天文学者，天文学家( astronomer的名词复数 )

参考例句：

• Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
• Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪，为什么只有土星有光环。 来自《简明英汉词典》

4 initially   

adv.最初，开始

参考例句：

• The ban was initially opposed by the US.这一禁令首先遭到美国的反对。
• Feathers initially developed from insect scales.羽毛最初由昆虫的翅瓣演化而来。

5 magnesium   

n.镁

参考例句：

• Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。
• The water contains high amounts of magnesium.这水含有大量的镁。

6 sodium   

n.（化）钠

参考例句：

• Out over the town the sodium lights were lit.在外面，全城的钠光灯都亮了。
• Common salt is a compound of sodium and chlorine.食盐是钠和氯的复合物。

7 silicon   

n.硅(旧名矽)

参考例句：

• This company pioneered the use of silicon chip.这家公司开创了使用硅片的方法。
• A chip is a piece of silicon about the size of a postage stamp.芯片就是一枚邮票大小的硅片。

8 sulfur   

n.硫，硫磺（=sulphur）

参考例句：

• Sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
• Burning may produce sulfur oxides.燃烧可能会产生硫氧化物。

9 doomed   

命定的

参考例句：

• The court doomed the accused to a long term of imprisonment. 法庭判处被告长期监禁。
• A country ruled by an iron hand is doomed to suffer. 被铁腕人物统治的国家定会遭受不幸的。

10 outwards   

adj.外面的，公开的，向外的；adv.向外；n.外形

参考例句：

• Does this door open inwards or outwards?这门朝里开还是朝外开？
• In lapping up a fur,they always put the inner side outwards.卷毛皮时，他们总是让内层朝外。

11 fending   

v.独立生活，照料自己( fend的现在分词 )；挡开，避开

参考例句：

• He is always spending his time fending with the neighbors. 他总是与邻里们吵架。 来自互联网
• Fifth, it is to build safeguarding system and enhance the competence in fending off the risk. 五是建立政策保障体系，提高防范和抵御风险的能力。 来自互联网

12 collapse   

vi.累倒；昏倒；倒塌；塌陷

参考例句：

• The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
• The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。

13 fusion   

n.溶化；熔解；熔化状态，熔和；熔接

参考例句：

• Brass is formed by the fusion of copper and zinc. 黄铜是通过铜和锌的熔合而成的。
• This alloy is formed by the fusion of two types of metal.这种合金是用两种金属熔合而成的。

14 collapses   

折叠( collapse的第三人称单数 )； 倒塌； 崩溃； （尤指工作劳累后）坐下

参考例句：

• This bridge table collapses. 这张桥牌桌子能折叠。
• Once Russia collapses, the last chance to stop Hitler will be gone. 一旦俄国垮台，抑止希特勒的最后机会就没有了。

15 rebound   

v.弹回；n.弹回，跳回

参考例句：

• The vibrations accompanying the rebound are the earth quake.伴随这种回弹的振动就是地震。
• Our evil example will rebound upon ourselves.我们的坏榜样会回到我们自己头上的。