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[探索发现] 2015-03-27 BBC:星光七纪元-20

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[探索发现] 2015-03-27 BBC:星光七纪元-20

 

 

 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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Actually, Arcturus is an omen of something far worse than the bad weather, a portended drama more intense than any of what you could imagine. When our own sun eventually becomes a red giant in 5 billion years time, it will turn into a destroyer rather than a protector of worlds. Doctor Robin Catchpole, has devoted his middle years to studying these devouring beast of the light. Their story starts the day the hydrogen in their core runs out. Most of the stars’ life, it spins  fusing hydrogen into helium. And this of course provides the pressure that resists the force of gravity. When the hydrogen runs out in the core we just got the helium. Then there is no source of energy, so the core starts to collapse. And as it collapses under the force of gravity, it heats up. And the temperature becomes high enough to start nuclear fusion reactions in the shell around the core. So we have what we call shell hydrogen burning. Fusion has stopped in the core. It's still hot, but it's dead. The star is now fundamentally different form our twinkling sun. The light we have seen is still being generated by nuclear fusion, but it's happening in a ring of hydrogen that surrounds the core instead.
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Actually, Arcturus is an omen of something far worse than the bad weather, a portended drama more intense than any of what you could imagine. When our own sun eventually becomes a red giant in 5 billion years time, it will turn into a destroyer rather than a protector of worlds. Doctor Robin Catchpole, has devoted his middle years to studying these devouring beast of the light. Their story starts the day the hydrogen in their core runs out. Most of the stars’ life, it spins  fusing hydrogen into helium. And this of course provides the pressure that resists the force of gravity. When the hydrogen runs out in the core we just got the helium. Then there is no source of energy, so the core starts to collapse. And as it collapses under the force of gravity, it heats up. And the temperature becomes high enough to start nuclear fusion reactions in the shell around the core. So we have what we call shell hydrogen burning. Fusion has stopped in the core. It's still hot, but it's dead. The star is now fundamentally different form our twinkling sun. The light we have seen is still being generated by nuclear fusion, but it's happening in a ring of hydrogen that surrounds the core instead.
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[Homework]2015-03-27 BBC:星光七纪元-20

Actually Arcturus is an omen of something far worse than bad weather, a portent to the drama more intense than any Hollywood could imagine, when our own Sun eventually becomes a red giant in 5 billion years' time, it will turn into a destroyer rather than a protector of worlds. Doctor Robin K has devoted his middle years to studying these devouring beasts of the light, their story starts the  day the hydrogen in their core runs out.
Most of the stars' life expands fusing hydrogen into helium, and this of course provides the pressure that resists the force of gravity, when the hydrogen runs out in the core, we'll just got pure helium, then there is no source of energy, so the core starts to collapse, and as it collapses under the force of gravity, it heats up, and the temperature becomes high enough to start nuclear fusion reactions in the shell around the core, so we have what we called shell hydrogen burn.
Fusion has stopped in the core, it's still hot but it's dead, the star is now fundamentally different from our twinkling Sun, the light we are seeing is still being generated by nuclear fusion, but it's happening in a ring of hydrogen that surrounds the core instead.

This post was generated by put listening repetition system,  Check the original dictation thread!
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Actually, arcturus is an omen of something far worse than bad weather. A portended drama more intense than any Hollywood could image. When our own sun eventually becomes a red giant in five billion years time, it will turn into a destroy rather than a protect of worlds. Doctor R P has devoted his middle years to studying this devouring beast of the night. They story starts the day that the hydrogen in their core runs out.
Most of star’s life expands fusing hydrogen into helium, and this of course provides the pressure that resists the force of gravity. When the hydrogen runs out in the core we just got core helium, then there is no source energy so the core starts to collapse, and as it collapses under the force of the gravity, it heats up, and temperature becomes high enough to star nuclear fusing reactions in a shell around the core, so we have what we called ‘shell hydrogen burning’.
Fusion has stopped in the core, it’s still hot but is dead, the star is now fundamental different from our twinkling sun, the light we’ve seen is still being generated by nuclear fusion but it’s happening in a ring of hydrogen that surrounds the core instead.
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