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Pronunciation varies by accent · noun
(astronomy) The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System..
The heliosphere isn’t really a sphere at all, more an elongated teardrop shape.
Use heliosphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heliosphere means (astronomy) The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The heliosphere isn’t really a sphere at all, more an elongated teardrop shape.
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