= Circumstellar envelope
{wiki=Circumstellar_envelope}
A circumstellar envelope is an outer region of gas and dust that surrounds a star or a stellar system. This envelope can arise from various processes, including stellar winds, mass loss from aging stars, and interactions with surrounding material. In many cases, particularly with evolved stars such as red giants or asymptotic giant branch (AGB) stars, these envelopes form as the star sheds its outer layers due to nuclear fusion processes ceasing or slowing down.
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