Olbers' paradox
(slang, derogatory, vulgar) A weak or submissive man.
Having good manners; polite, courteous, and socially correct; conforming to standards of good behaviour.
plural of meningioma
(astronomy) The observation that the night sky is mostly dark, yet, in a boundless universe of stars, every line of sight from the eye must eventually intercept the surface of a star.
教授は、無限に広がる恒星で満たされた宇宙ならどの視線もやがて恒星の表面に届くはずなのに夜空がほとんど暗いという観測（オルバースの逆説）を用いて、なぜ夜空が暗いのかを説明した。
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