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Pronunciation varies by accent · noun
A cavity filled with hot gas blown into the interstellar medium by stellar winds..
Use astrosphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Astrosphere means A cavity filled with hot gas blown into the interstellar medium by stellar winds..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use astrosphere where its definition matches the intended context.
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