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[BBC系列]：再见星球冥王星Bye Bye Planet Pluto-1080P高清迅雷网盘下载
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由伊恩·霍尔姆（Ian Holm）主持并由??英国广播公司（BBC）发行的科学纪录片，作为2006年英国广播公司地平线系列的一部分播出-英语旁白Science Documentary hosted by Ian Holm and published by BBC broadcasted as part of BBC Horizon series in 2006 - English narration
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共同发现者查德·特鲁希略（Chad Trujillo）博士认为解决方案非常简单：“在逻辑上一致的事情是要么让2003 UB313成为行星，使冥王星成为行星，要么都不是行星，”他告诉BBC的Horizo??n计划。但是冥王星已经是一个不寻常的星球。它主要由冰制成，甚至比地球的月球还小。1992年，夏威夷大学的戴夫·杰维特教授和陆珍博士发现了海王星以外的新天体集合，称为柯伊伯带。有人建议不要把冥王星当作一个行星，而应该把它当作一个柯伊伯带天体。正如杰威特教授所说：“我们总是说我们发现了一个加伊珀尔带，减去了一颗行星。而我们失去的那颗行星，当然是冥王星。 ”?有很多天文学家都同意戴夫·杰维特的观点，他们会选择八行星的太阳系，而冥王星或2003 UB313均未达到这一标准。但是许多天文学家正在争论对行星的更具体定义。亚利桑那州洛厄尔天文台的库珀带研究人员马克·布伊博士提出了一个明确的行星定义，他希望IAU采纳。不同的类别”我认为行星的定义应该尽可能简单，因此我提出了两个标准。”他说，“其中之一是它的大小不能燃烧自己的物质，这就是恒星所做的。从小角度来看，我认为应该是行星而不是行星之间的边界，物体的引力是否强于物体的材料的强度？这是一种奇特的说法，它是圆形的吗？”?特鲁希略认为，冥王星和2003 UB313既是两者皆有，也不是两者皆有，这个定义可能导致一个太阳系拥有多达20个行星，其中包括冥王星（2003 UB313）和许多以前被归类为卫星或小行星的天体。是要介绍的新类别的行星。水星，金星，地球和火星将是“岩石行星”。气体巨人木星，土星，天王星和海王星将是第二类。冥王星，2003 UB313，以及通过“圆度测试”的任何其他物体，将被重新分类为第三种行星，也许是“冰矮星”。最终结果是，到9月，太阳系将不再有9个行星。冥王星和2003 UB313两者皆有或两者无一的情况，这个定义可能导致一个太阳系拥有多达20个行星，其中包括冥王星2003 UB313，还有许多以前被归类为卫星或小行星的天体。要介绍的行星类别。水星，金星，地球和火星将是“岩石行星”。气体巨人木星，土星，天王星和海王星将是第二类。冥王星，2003 UB313，以及通过“圆度测试”的任何其他物体，将被重新分类为第三种行星，也许是“冰矮星”。最终结果是，到9月，太阳系将不再有9个行星。冥王星和2003 UB313两者皆有或两者无一的情况，这个定义可能导致一个太阳系拥有多达20个行星，其中包括冥王星2003 UB313，还有许多以前被归类为卫星或小行星的天体。要介绍的行星类别。水星，金星，地球和火星将是“岩石行星”。气体巨人木星，土星，天王星和海王星将是第二类。冥王星，2003 UB313，以及通过“圆度测试”的任何其他物体，将被重新分类为第三种行星，也许是“冰矮星”。最终结果是，到9月，太阳系将不再有9个行星。辩论的一种可能的解决方案是引入新的行星类别。水星，金星，地球和火星将是“岩石行星”。气体巨人木星，土星，天王星和海王星将是第二类。冥王星，2003 UB313，以及通过“圆度测试”的任何其他物体，将被重新分类为第三种行星，也许是“冰矮星”。最终结果是，到9月，太阳系将不再有9个行星。辩论的一种可能的解决方案是引入新的行星类别。水星，金星，地球和火星将是“岩石行星”。气体巨人木星，土星，天王星和海王星将是第二类。冥王星，2003 UB313，以及通过“圆度测试”的任何其他物体，将被重新分类为第三种行星，也许是“冰矮星”。最终结果是，到9月，太阳系将不再有9个行星。At its conference this August, the International Astronomical Union (IAU) will make a decision that could see Pluto lose its status as a planet.For the first time, the organisation will be officially defining the word "planet", and it is causing much debate in the world of astronomy.There is only one thing that everyone seems to agree on: there are no longer nine planets in the Solar System.Matters were brought to a head by the discovery in January of last year of a potential 10th planet, temporarily named 2003 UB313.Professor Mike Brown and his team at the California Institute of Technology have already discovered several large objects on the edge of the Solar System, but 2003 UB313 is special because it is bigger than Pluto.The question now facing the IAU is whether to make this new discovery a planet.Pressing issueCo-discoverer Dr Chad Trujillo thinks the solution is pretty straightforward."The logically consistent thing would be to either have 2003 UB313 a planet, and Pluto be a planet; or have neither be a planet," he told the BBC's Horizon programme.But Pluto is already an unusual planet. It is made predominantly of ice, and is smaller even than the Earth's Moon.In 1992, Professor Dave Jewitt and Dr Jane Lu at the University of Hawaii discovered a new collection of objects beyond Neptune called the Kuiper Belt. Some suggest Pluto should no longer be considered a planet, but a Kuiper Belt Object.As Professor Jewitt says: "We always say we found plus one Kuiper Belt, and minus one planet. And the one we lost, of course, is Pluto."There are many astronomers who agree with Dave Jewitt and would opt for an eight-planet Solar System, with neither Pluto or 2003 UB313 making the grade; but a number of astronomers are arguing for a more specific definition of a planet.Kuiper Belt researcher Dr Marc Buie, of the Lowell Observatory in Arizona, has come up with a clear planetary definition he would like to see the IAU adopt.Different categories"I believe the definition of planet should be as simple as possible, so I've come up with two criteria," he said."One is that it can't be big enough to burn its own matter - that's what a star does. On the small end, I think the boundary between a planet and not a planet should be, is the gravity of the object stronger than the strength of the material of the object? That's a fancy way of saying is it round?"Trujillo thinks it's a case of both or neither for Pluto and 2003 UB313This definition could lead to a Solar System with as many as 20 planets, including Pluto, 2003 UB313, and many objects previously classified as moons or asteroids.One possible resolution to the debate is for new categories of planet to be introduced. Mercury, Venus, the Earth and Mars would be "rocky planets". The gas-giants Jupiter, Saturn, Uranus and Neptune would be a second category.Pluto, 2003 UB313, and any other objects passing the "roundness test", would be reclassified as a third type of planet - perhaps "icy dwarfs".Whatever the final outcome, by September there will no longer be nine planets in the Solar System.
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【技术参数】——
视频编码: XVID
比特率: 1708 kbps
Video 分辨率: 624x352
音频编码: MP3
音频比特率: 129 kb/s (64/ch) CBR 48000 Hz
分集时长: 48m
体积: 640mb
发布人： ACook【Technical Specs】——
Video Codec: XVID
Video Bitrate: 1708 kbps
Video Resolution: 624x352
Audio Codec: MP3
Audio BitRate: 129 kb/s (64/ch) CBR 48000 Hz
RunTime: 48m
Part Size: 640mb
Ripped by ACook
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Space (BBC)
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The Moon
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Titan a Place Like Home
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