经常有人问：“学完了有什么用？”常睿觉得她给不出多完美的答案，她用一段经历解释了这段读书之旅对她的意义：2018 年夏天，拿到硕士研究生录取通知书的同时，她身体出现了一些情况，等待结果的时候，她脑子里想的是，幸亏考上了，就算结果不好，能读三年书，也此生无憾。
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There is a plan to prevent such a strike—the Space Surveillance Network, a bevy of sensors that the military uses to track space debris. NASA monitors what’s unofficially known as the “pizza box,” a sort of no-fly zone around the ISS. When pieces of debris are predicted to enter the box—if there’s at least a 1 in 100,000 chance of collision—mission controllers order avoidance maneuvers, firing thrusters that move the ISS and dodge the trash. The technique has been used dozens of times since the first ISS module launched in 1998. But the system only tracks about 45,000 larger pieces, and all sensors have noise. Plus, risk thresholds can miss stuff, sometimes badly. In 2025, Chinese astronauts were briefly stranded at their station after debris hit their return vehicle.