我的青少年时代在黄土高原腹地甘肃省定西市安乐村度过。每逢暑假，我和哥哥总会在外婆家住几天。外婆家不远处那片被庄稼层层环绕的黄土山，是我最熟悉的风景。我们经常踩着田埂间没膝的狗尾巴草与蒲公英，深一脚浅一脚地攀爬。那时的我还不知道，这片承载童年欢声笑语的“土山”，是第四次全国文物普查中新发现的北宋故城遗址——张川城遗址。这15到20厘米厚、层层叠叠的夯土层里，竟藏着古人筑城戍边的智慧。那些与庄稼共生的黑釉、褐釉陶瓷片，曾是北宋先民碗碟中的烟火生活，沉淀着上千年的光阴。
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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.