The theoretical region or sphere of gravitational influence surrounding a massive object like a star or planet.
From Latin 'gravis' (heavy, gravity) combined with Greek 'sphaira' (sphere), creating a term for the zone where gravity dominates. This is modern scientific terminology.
Every object in the universe has a gravisphere—even you have one, though yours is unimaginably tiny compared to Earth's or the Sun's; it's the invisible sphere where your gravity extends into space.
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