gravity darkening
A common bird of the species Turdus merula, native to Eurasia.
(humorous) An explanation for a crash of thunder.
(physics, astronomy) The phenomenon of a star rotating so rapidly that it is oblate, with a larger radius and thus lower surface gravity at the equator (which is thus cooler and darker: gravity-darkened), and higher surface gravity at the poles (which are hotter and brighter: gravity brightened).
plural of Prihoda
天文学者たちは高速回転する恒星で表面重力差による暗化を観測し、そのため赤道が極よりも低温で暗く見えることを確認した。
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