柯林斯词典nebula /ˈnɛbjʊlə/ (nebulae) 1. N-COUNT A nebula is a cloud of dust and gas in space. New stars are produced from nebulae. 星雲[oft in names] 返回 nebula剑桥词典a cloud of gas or dust in space , appearing either bright or dark 星雲 返回 nebula