A theoretical or hypothetical sphere or region in space defined by astronomical or astrophysical properties, sometimes referring to the region of stellar influence or cosmic zones.
From astro- (star) and -sphere (from Greek sphaira, ball or globe). A less common technical term used in various astronomical or cosmological contexts.
While astrosphere isn't as common as terms like biosphere or atmosphere, the concept matters in astrobiology—we talk about the habitable sphere around a star, the extent of a star's gravitational influence, and how different cosmic zones interact.
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