うちゅうちへいせん 宇宙の地平線 LinksSentence search for 宇宙の地平線Sentence search for うちゅうのちへいせんKanji details for 宇, 宙, 地, 平 and 線Edit in JMdict Expressions (phrases, clauses, etc.), Noun1. particle horizon of the observable universeAstronomy, See also 事象の地平線 Discussions Log in to talk about this word.