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[探索发现] 2015-05-06 BBC:星光七纪元-31

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[探索发现] 2015-05-06 BBC:星光七纪元-31

 

 

 BBC: Seven Ages of Starlight |  英国广播公司星光七纪元

 

 BBC: 恒星七纪

 

这是一个关于恒星的史诗般的故事,以及发现它们的故事是如何转变了我们对于宇宙的理解。曾几何时我们认为太阳和恒星是众神和巨人。现在我们知道,在某种意义上,我们是对的。恒星都有它们独特的特点,历史和在宇宙中的角色。最起码,它们在创造我们的过程中扮演了极其重要的角色。

This is the epic story of the stars, and how discovering their tale has transformed our own understanding of the universe.

Once we thought the sun and stars were gods and giants. Now we know, in a way, our instincts were right. The stars do all have their own characters, histories and role in the cosmos. Not least, they played a vital part in creating us.

 

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原文http://www.putclub.com/html/listening/guide/2004/0509/5357.html

 

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And with his colleagues, he did the calculations to prove it. The key was the conditions created in the final stages about massive stars fighting against its gravity. These stars are so massive and hot that they can go through a whole series of nuclear reactions. The ashes of one set of nuclear reactions becomes the fuel for the next set of nuclear reactions. The most massive stars are able to fuse heavier and heavier elements in the series of layers, creating the energy to resist the relentless inward pull of gravity. There is neon and magnesium and more oxygen, then the silicon and sulphur, and finally, in the middle, a core of Iron. And that’s where the fusion starts. With fusion at an end, there is no more energy to fight back. And gravity wins the battle. The star is doomed. When that ball of iron, which is a certain critical mass, about the size of the earth but much, much more massive, the electron pressure is no longer able to support it against the inward force of gravity, so it starts to collapse. It collapses to a ball, about the size of a city and then rebounds, and that rebounce hits the surrounding layers, launching a supernovae explosion. It’s the speed and violence of the collapse of the star’s iron core that triggers the supernovae.
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[Homework]2015-05-06 BBC:星光七纪元-31

And with his colleagues, he did the calculations to prove it, the key was the conditions created in the final stages of a massive star's fight against gravity.These stars are so massive and hot that they can go through a whole series of nuclear reactions, the ashes of one set of nuclear reactions becomes the fuel for the next set of nuclear reactions.
The most massive stars are able to fuse heavier and heavier elements in a series of layers, creating the energy to resist the relentless inward pull of gravity.
There is neon and Magnesium and more oxygen, then there is silicon and sulphur, and finally in the middle a core of iron, and that's where the fusion stops.
With fusion at an end, there is no more energy to fight back, and gravity wins the battle, the star is doomed.
When that ball of iron which is a certain critical mass about the size of the Earth, but much much more massive, the electron pressure is no longer able to support it against the inward force of gravity, so it starts to collapse, it collapses to a ball about the size of a city, and then rebounds and that rebounds hits the surrounding layers, launching a supernova explosion.
It's the speed and violence of the collapse of the star's iron core that triggers the supernova.

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And with his colleagues, he did the calculations to prove it. The key was condition created in the final stages of massive stars fight against gravity.
These stars are so massive and hot that they can go through a whole series of nuclear reactions that the ashes of the one set of nuclear reactions becomes the fewer for the next set of nuclear reactions.
The most massive stars are able to fuse heavier and heavier elements in a series of layers, creating the energy to resist relentless inward pull of the gravity.
There is neon and magnesium and more oxygen, then there is silicon and sulphur, and finally in the middle a core of iron, and that’s where the fusion stars.
With the fusion at end, there is no more energy to fight back, and gravity wins the battle. The star is doomed.
When that ball of iron which is a certain critical mass about the size of the Earth, but much, much more massive. The electron pressure is no longer able to support against the inward force of gravity, so it starts to collapse, it collapses to a ball, about the size of a city, and then rebounds, and that rebounds hits the surrounding layers, launching a supernovae explosion.
It is the speed and violence of the collapse of the star’s iron core that triggers the supernovae.
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