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"He goes: 'Bricks are heavy.' And he said: 'So heavy bricks don't go very far.'"
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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.
相較之下,YouGov是「自願參加」的調查平台,人們自行報名以換取積分,積分可兌換現金。
习近平总书记意味深长地说:“每个时代都要做出每个时代的事情来。做得好、做得坏,贡献大、贡献小,青史可鉴啊!共产党人一定要为人民做好事。”