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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...。顾炳勋惨死，顾氏家族同胞姐妹反目。姐姐顾玉枝忍痛背着不孝的罪名，投身于严酷的斗争中；而妹妹顾玉倩沦为国民党军统特务。重庆地下党送往延安的通讯器材屡遭敌特阻截。顾玉枝借送亡父灵位回陕西之名，亲自将器材送往延安。岂料姐妹俩同时出现在飞机中，顾玉枝沉稳机智地转移了器材，使守候在西安机场的余亚廷扑空。敌人派出叛徒追踪至西安进行破坏。探明叛徒吴章行踪后，顾玉枝夜击吴章，陷入重围之中，幸得顾家私人保镖黄子农相救才脱离险境。余亚廷率人扮成土匪，劫获电台器材，正当他们举杯庆贺时，顾玉枝杀个回马枪抢走了器材。即将进入解放区时，一辆吉普车挡在了前头，短兵相接，硝烟散尽，玉枝，玉倩姐妹对峙。猝然，两枝乌黑冰冷的枪管同时对准了她俩，玉倩终于明白了黄子农是杀父仇人，而玉枝也悔恨未能及时识破身边的军统特务的面目。枪响了，玉倩倒下，黄子农却栽倒在玉枝脚下。原来，协助余亚廷，顾玉倩阻截器材的张若瑜，正是打入敌人心脏的我地下党员。顾玉枝埋葬了战友及亲人的尸体，重新踏上了征程。。