near-earth object
noun [ C ] uk/ˌnɪərˌɜːθ ˈɒb.dʒɪkt/ us/ˌnɪrˌɝːθ ˈɑːb.dʒɪkt/ (abbreviation NEO)
近地天体
an object in space, for example an asteroid, comet, or meteoroid that sometimes passes close to the earth
The task of finding and tracking large near-earth objects more than one kilometre across has been assigned to the Spaceguard Survey. 发现和跟踪直径超过一千米的大型近地天体的任务已交给“空间卫士勘测计划”来做。