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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随着2025年四季度外卖平台补贴力度收紧，行业逐渐向理性竞争回归，瑞幸也在主动调整策略以缓解盈利压力。事实上，瑞幸早在2024年就开始收紧9.9元低价活动覆盖范围，2025年进一步限制于少量基础款，多数产品回升至10.9-13.9元区间，通过优化定价策略平衡营收增长与盈利水平。这种调整背后，是瑞幸对“规模+盈利”双重目标的追求，也是行业从价格战向价值竞争转型的缩影。