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[BBC系列]：泰坦像家一样的地方Titan a Place Like Home-1080P高清迅雷网盘下载
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由伊恩·霍尔姆（Ian Holm）主持，英国广播公司（BBC）发行的科学纪录片，作为2005年BBC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 2005 - English narration
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在十亿公里之外，土星最大的卫星土卫六提供了有关地球生命起源的诱人线索。在有史以来最雄心勃勃，最昂贵的行星际太空飞行任务中，卡西尼-惠更斯号航天器进行了长达七年的跋涉，穿越了太阳系，土星和它的许多卫星的第一张特写照片是由旅行者号深空探测器于1980年代初拍摄的。其余所有月亮都突出了，泰坦的神秘月亮。与以前从未见过的月亮不同，它具有浓厚的类似于地球的大气层。它也被厚厚的橙色雾笼罩，使旅行者号看不到月球表面。科学家们知道他们必须回去.1997年推出，卡西尼-惠更斯号飞船是美国国家航空航天局（NASA）与欧洲航天局之间独特的，横跨大西洋的32亿美元合作的结果。由美国宇航局（NASA）在加利福尼亚州帕萨迪纳（Pasadena）进行的JPL任务控制操纵，该飞行器花了7年才到达土星。经过两次金星的长弹弓路线，地球和木星以足够的速度到达最终目的地。2004年7月，当它最终到达时，飞船不得不进行非常危险的操纵并在土星环之间穿行，进入巨大行星的轨道。即使是最细微的灰尘也可能飞过飞船并摧毁了飞行任务。2004年圣诞节，欧洲制造的惠更斯号探测器终于从卡西尼号母舰上释放出来，准备降落至泰坦。探测器的轨迹必须绝对正确，因为没有任何引擎，即使是轻微的错误判断也无法在以后纠正，这意味着惠更斯完全没有达到目标。2005年1月14日。惠更斯号探测器终于到达了土卫六的高空。任务控制现已转移到德国达姆斯塔德（Darmstardt）的欧洲航天局（ESA），但是科学家只能坐着等待，因为探测器正在自动运行。为了获得任何成功的机会，探头的隔热罩必须保护飞行器免受猛烈的再进入温度的影响，并且其三个降落伞必须按顺序正确部署以减缓其下降速度。令人惊讶的是，很久很久之前，他们就希望听到惠更斯的来信，探测器微弱的载波信号是由西弗吉尼亚州格林班克的大型罗伯特·伯德射电望远镜在地球上拾取的。不比手机强多少?并穿越了十亿公里的太空，信号太微弱，无法传送任何真实数据，但至少他们知道探针已经幸免于难，现在正处于降落伞下。几个小时后，科学数据终于开始传来，通过轨道的卡西尼号。令他们感到震惊的是，重要的数据流之一并未打开。幸运的是，大多数数据都是通过单个通道传输的，但至关重要的是一半的图像丢失了。经过多年的等待，泰坦终于被揭露了。惠更斯的建造是为了嗅探和品尝下降的大气层，因此发现它在很多方面都与40亿年前的地球相似。泰坦的化学物质距离我们所认为的“生命”还有很长的路要走，但人们发现它含有丰富的有机碳基化学物质混合物，Over a billion kilometres away, Saturn's largest moon, Titan, holds tantalising clues to how life began here on EarthIn the most ambitious and expensive interplanetary space mission of all time, the Cassini-Huygens spacecraft made a seven-year trek across the Solar System to attempt first contact with the Earth-like moon of Titan by landing a probe on its unseen surface.The first close up images of Saturn and its many moons were taken in the early 1980s by the Voyager One Deep Space Probe. One moon stood out from all the rest, the mysterious moon of Titan. Unlike any moon that had ever been seen, it had a thick almost Earth-like atmosphere. It was also shrouded in a thick orange haze which prevented Voyager from seeing down to the moon's surface. Scientists knew they had to go back.Launched in 1997, the Cassini-Huygens spacecraft was the result of a unique transatlantic $3.2 billion collaboration between NASA and the European space agencies. Steered from NASA's JPL mission control in Pasadena California, the craft took seven years to reach Saturn. It took a long slingshot route via Venus twice, the Earth and Jupiter to pick up enough speed to reach its final destination.When it finally arrived in July 2004, the spacecraft had to carry out a very dangerous manoeuvre and pass between Saturn's rings in order to get into orbit around the giant planet. Even the tiniest grain of dust could have ripped through the spacecraft and destroyed the mission.On Christmas Day 2004, the European-built Huygens probe was finally released from the Cassini mothership, ready to descend to Titan. The probe's trajectory had to be absolutely spot on, as without any engines even a slight misjudgement could not be corrected later and would mean Huygens missing its target altogether.January 14 2005. The Huygens probe finally reached Titan's upper atmosphere. Mission control had now transferred to ESA in Darmstardt, Germany, but all the scientists could do was sit and wait, as the probe was running on automatic. For any chance of success, the probe's heat shield had to protect the craft from the fierce temperatures of re-entry, and its three parachutes had to deploy correctly in sequence to slow its descent.Amazingly, long before they expected to hear from Huygens, the probe's faint carrier signal was picked up on Earth by the massive Robert C Byrd radio telescope at Greenbank in West Virginia. Not much stronger than a mobile phone, and travelling over a billion kilometres through space, the signal was too weak to carry any real data, but at least they knew the probe had survived entry and was now under parachute.Some hours later, the scientific data finally started coming through, relayed via the orbiting Cassini. To their horror, one of the vital data-streams had not been switched on. Fortunately most of the data was coming through on the single channel, but crucially half the images were lost.After years of waiting, Titan was finally revealed. With Huygens built to sniff and taste the atmosphere on its way down, it discovered it was similar in many ways to that of the Earth in its infancy, four billion years ago. Titan's chemistry is still a long way from what we see as 'living', yet it was found to contain a rich cocktail of organic carbon-based chemicals, thought to be important as the precursors to life.Now visible beneath the impenetrable orange haze, Titan appears to look a lot like Earth. The images beamed back from over a billion kilometres away show lake beds, river channels, gulleys and canyons. But these river channels are gouged not by water, but by a rain of liquid methane. The surface itself is not made of rock, but of solid ice, and Huygens' landing site was strewn with small round ice pebbles, lying in a bed of icy sand grains. Although home to a somewhat cold alien chemistry, in many respects Titan is driven by exactly the same geological and meteorological processes that shape and contour our own planet. Titan is certainly a place like home.
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【技术参数】——
视频编码: Divx 5.21
比特率: 1119 kb/s
Video 分辨率: 720x400 (1.80:1)
Video 画面比例: 16:9
音频编码: MP3
音频比特率: 160 kb/s (80/ch, stereo) CBR 44100 Hz
Audio 声道数: 2
分集时长: 49m
体积: 449mb
发布人： cotcubt (UKNova)【Technical Specs】——
Video Codec: Divx 5.21
Video Bitrate: 1119 kb/s
Video Resolution: 720x400 (1.80:1)
Video Aspect Ratio: 16:9
Audio Codec: MP3
Audio BitRate: 160 kb/s (80/ch, stereo) CBR 44100 Hz
Audio Channels: 2
RunTime Per Part: 49m
Part Size: 449mb
Ripped by cotcubt (UKNova)
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Related Documentaries
Goodbye Cassini: Hello Saturn
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Finding Life Beyond Earth
Destination Titan
Life (BBC The Sky at Night)
Home from Home
Bye Bye Planet Pluto
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Life on Mars (Horizon)
Mars Rising
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Space (BBC)
The Moon
The Planets
The Sun
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发表于 2020-7-13 23:29:57
发表于 2020-7-23 23:05:01