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.
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这牛重得实在费劲，走在前面的人抬着木桩，后面的人就得高举木桩，才能保持牛身平衡。接二连三有人踩滑摔趴在地上，被旁边的人拉起来后，大伙继续齐喊“一二走——一二走——一二走”，山沟里的回声都是铿锵有力的。