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.
Astronauts Butch and Suni finally back on Earth
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有摆脱贫困的人间奇迹。2021年2月25日，习近平总书记庄严宣告：“我国脱贫攻坚战取得了全面胜利，现行标准下9899万农村贫困人口全部脱贫”。困扰中华民族几千年的绝对贫困问题，得到历史性解决。
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