美国航天局警告说,尽管取得了进展,但数千个危险小行星仍未被发现,而且地球缺乏现成防御系统。 NASA warns that thousands of dangerous asteroids remain undetected, and Earth lacks a ready defense system despite progress.

NASA警告说,大约15,000个中型小行星,每个小行星至少140米宽,并且能够摧毁城市,尽管在行星防御方面取得了进展,但仍未被发现,构成了重大威胁。 NASA warns that around 15,000 medium-sized asteroids, each at least 140 meters wide and capable of devastating cities, remain undetected, posing a significant threat despite progress in planetary defense. 虽然2022年DART飞行任务证明小行星的偏转是可能的,但没有现成的部署系统可以应付实际迫在眉睫的威胁。 While the 2022 DART mission proved asteroid deflection is possible, no ready-to-deploy system exists for an actual imminent threat. 目前的探测工作只查明了其中大约40%的物体,其中许多被黑暗或阳光遮蔽。 Current detection efforts have only identified about 40% of these objects, with many hidden by darkness or sun glare. 美国航天局计划在2027年发射近地物体测量仪空间望远镜,以改进遥感热量探测,但专家强调,资金和备灾缺口使地球易受突发影响。 NASA plans to launch the Near-Earth Object Surveyor space telescope in 2027 to improve detection by sensing heat, but experts stress that funding and preparedness gaps leave Earth vulnerable to sudden impacts.