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[探索发现] 2015-04-17 BBC:星光七纪元-26

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[探索发现] 2015-04-17 BBC:星光七纪元-26

 

 

 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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That’s why what we physicists called pressure. This pressure is created as the particles jostle for position. It’s a principle of Quantum Mechanics and when it was applying to stars, the lives of dead white dwarfs suddenly made sense. What stopped them collapsing completely was the gravity which was resisted by the pressure generated between the particles themselves. In a white dwarf, you got a delicate balance between the gravity which was trying to squeeze it together and the pressure of these electrons, trying up to all, have their addresses in the same place that are trying to push out. And it’s a balance between this gravity pulling in and electrons’ pushing out that keeps the white dwarf the size it is. It’s also what lets the star with no fuel supply shine for billions of years. These white dwarfs are very small so they got very small surface area, which means although they are white hot, the light they emit, the heat energy which they send out is still very limited just because of the very small size of the surface. Now it carries on, radiating light and gradually cools down, gradually gets dimmer and dimmer. It’s a little bit like a retired person sitting in an old star’s home. It’s still, you know, ticking alone but gradually gets sort of slower and slower, dimmer and dimmer. There are white dwarfs cluttering up our galaxy, all the other galaxies.
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[Homework]2015-04-17 BBC:星光七纪元-26

That's like what we physicists call pressure. This pressure is created as the particles jostle for position, it's a principal of quantum mechanics, and when it was applied to stars, the lives of dead white dwarfs suddenly made sense, what stop them collapsing completely was that gravity was resisted by the pressure generated between the particles themselves.
In a white dwarf you got a delicate balance between the gravity which is trying to squeeze it together, and the pressure these electrons trying not to all have their dresses in the same place that are trying to push out, and it's a balance between this gravity pulling in and the electrons pushing out that keeps the white dwarf the size it is.
It's also what lets a star with no fuel supply, shine for billions of years.
These white dwarfs are very small, so they got a very small surface area which means although they are white hot, the light they emit, the heat energy which they send out is still very limited just because the very small size of the surface, it carries on radiating light, and it gradually cools down, it gradually gets dimmer and dimmer, it's little bit like a retired person sitting in an old stars' home, it's still ticking along, but it gradually gets slower and slower, dimmer and dimmer, there are white dwarfs cluttering up our galaxy, all the other galaxies.

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That’s why what we physicists call pressure.
This pressure is created as the particles jostle for position, it’s a principal of quantum mechanics, and when it was applied to stars, the lives of dead white dwarfs suddenly made sense. What stop them collapsing completely was the gravity was resisted by the pressure generated between particles themselves.
You know white dwarf, you got a delicate balance between the gravity which try to squeeze together and the pressure of these electrons trying not all have their dresses in the same place that try to push out and it’s a balance between these gravity pulling in and electrons pushing out that keeps the white dwarf the size it is.
It’s also what let’s a star with no fuel supply, shinning for billions of years.
These white dwarfs also are very small, so they got a very small surface area which means although their white hot, the light they emit, the heat energy which they send out is still very limited just the very small size of the surface, now carries on radiating light and it gradually cools down, it gradually gets dimmer and dimmer, it’s a little bit like a retired person sitting in an old star’s home, it’s still you know ticking along, but it gradually gets slower and slower, dimmer and dimmer, there are white dwarfs cluttering up our galaxy, or the other galaxy
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