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In 2014, the International Space Station had to move three times to avoid lethal chunks of space debris and there is an increasing problem of satellites mysteriously breaking down. With first-hand accounts from astronauts and experts, Horizon reveals the scale of the problem of space junk. Our planet is surrounded by hundreds of millions of pieces of junk moving at 17,000 miles...。以2020年珠峰测高这一重大事件作为主线，以珠穆朗玛峰的形成、环境更替、生物演变和文化交流作为副线，为中外观众全面呈现一个神秘而伟大的珠穆朗玛。。