Heliosphere: the magnetic bubble of hot plasma around the Sun caused by the solar wind's expansion out into space. The heliosphere meets the interstellar medium at the heliopause.
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It is bounded at its outer extremities by the limit of the Sun's gravitational and magnetic influence (heliosphere) at a distance of approx 100 AU from the centre of the Sun. Here the solar wind meets the interstellar medium.
 See also: Equinox, Degree, Relationship, Uranus, Opposition
  
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