R is for ... Roche Lobes! The "Universe ABC Guide" is the ultimate source for learning amazing facts about the universe for each letter of the alphabet.
A Roche lobe is the tear-drop shaped region around each of the bodies in a binary that is bounded by the critical gravitational equipotential of the L1 (Lagrange-1) point. Named for Édouard Roche, along with related concepts of the Roche sphere (aka Hill sphere) and the Roche limit!
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Thumbnail image: Accretion Disk Binary System Drawing (Credit: ST ScI/NASA)
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Universe ABC Guide: R is for Roche Lobes!
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