Boundary between the heliospherethe teardrop-shaped region around the Sun created by the solar wind and filled with solar magnetic fields and outward-moving gasand the zone of transition to the interstellar medium. Its tail is estimated to reach 110–170 astronomical units from the Sun, encompassing the orbits of all the major planets. Its shape changes, influenced by a wind of interstellar gas produced by the Sun's motion through it.
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