Episode Description from the Publisher
你手机里每一个导航、每一次外卖定位，背后都飘着几百颗人造卫星。这期咱们搞懂卫星为啥不掉下来——说白了就是开普勒定律加一个"刚刚好"的速度，快了飞走、慢了砸地。聊同步轨道为什么非得在36000公里高，聊太阳同步轨道怎么帮遥感卫星每天同一时刻拍地球，再聊GPS那套"用时间差算位置"的绝活。最后说说星链这种巨型星座，几千颗卫星铺成一张网。一颗铁疙瘩为啥能稳稳挂天上几十年？我们头顶飘着几千双"眼睛"，它们到底是守护，还是另一种拥挤的开始？
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