The vast bubble-like region of space dominated by the solar wind and the Sun's magnetic field, extending far beyond the orbit of Pluto. It acts as a partial shield protecting the solar system from interstellar radiation and cosmic rays.
From Greek 'helios' meaning 'sun' and Latin 'sphaera' meaning 'sphere.' The term was introduced in the 1960s as scientists began to understand that the Sun's influence extends far beyond the visible planets, creating a distinct region in space.
The heliosphere is like a cosmic bubble bath - our entire solar system sits inside this protective bubble that the Sun blows in the interstellar medium! The Voyager spacecraft are humanity's first ambassadors to cross the boundary of this bubble, giving us our first direct measurements of interstellar space.
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