Common envelope

A common envelope is a brief but dramatic phase in the life of a binary star system where two stars orbit so closely that they merge into a single, shared gaseous shell.

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A common envelope is a brief but dramatic phase in the life of a binary star system where two stars orbit so closely that they merge into a single, shared gaseous shell. During this phase, the outer layers of an evolved star envelop its companion star, and the two stars spiral inward toward each other through the de…