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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...。伊犁河是亚洲中部蜿蜒在天山山脉中的一条内陆河，其流域是古代中国北方及中亚游牧部落的重要栖息地，乌孙、匈奴、柔然、突厥、回鹘、契丹、蒙古等游牧民族所建立的草原帝国的兴衰深刻地影响着中国、中亚乃至世界历史的进程。。