PBS NOVA 北极恐龙 PBS NOVA Arctic Dinosaurs 720P[HDTV]

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资源信息： 中文名: PBS NOVA 北极恐龙 英文名: PBS NOVA Arctic Dinosaurs 资源格式: HDTV 版本: 720P 发行时间: 2008年10月07日 制作发行: PBS 地区: 美国 语言: 英语 概述:

【类型】：历史/考古/记录 【集数】：1集 【片长】：52:29 【内容简介】： 恐龙是如何设法生存甚至兴旺的生活在阴霾黑暗和寒冷的极地地区？这是一个最引人兴趣的谜一般的的古生物学话题。现在，这个独特领域的探险队远征阿拉斯加将利用极端的工程学和危险化石解冻寻找新线索。在令人震惊的CGI的帮助下 ，NOVA将揭示极地恐龙的生活和环境的生动细节。 Most people imagine dinosaurs lurking in warm locales with swamps and jungles, dining on vegetation and each other. But a new NOVA documentary reveals that many species also survived and thrived in the harsh environments of the north and south polar regions. This program focuses on two high-stakes expeditions and the paleontologists who push the limits of science to unearth 70 million-year-old fossils buried in the vast Alaskan tundra. NOVA takes viewers on an exciting Arctic trek as one team of paleontologists attempts a radical "dig" in northern Alaska, using explosives to bore a 60-foot tunnel into the permafrost in search of fossil bones. Both the scientists and the filmmakers face many challenges while on location, including plummeting temperatures and eroding cliffs prone to sudden collapse. Meanwhile, a second team of scientists works high atop a treacherous cliff to unearth a massive skull, all the while battling time, temperature, and voracious mosquitoes. The hardy scientists shadowed in "Arctic Dinosaurs" persevere because they are driven by a compelling riddle: How did dinosaurs—long believed to be cold-blooded animals—endure the bleak polar environment and navigate in near-total darkness during the long winter months? Did they migrate over hundreds of miles of rough terrain like modern-day herds of caribou in search of food? Or did they enter a dormant state of hibernation, like bears? Could they have been warm-blooded, like birds and mammals? Top researchers from Texas, Australia, and the United Kingdom converge on the freezing tundra to unearth some startling new answers. Finally, the program touches on the ultimate implications of dinosaur survival. Did a catastrophic asteroid impact 65 million years ago wipe out the dinosaurs, as most people now believe, or did more gradual ecological changes play an equally decisive role in their demise? Like a good detective story, "Arctic Dinosaurs" fingers new suspects in its search for answers to the extinction riddle, including massive volcanic eruptions, shifting continents, and a gradual climatic chill—the opposite of today's global warming. Throughout, the documentary brings the world of arctic dinosaurs vividly to life through compelling computer-generated imagery