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The solar system isn’t just a collection of planets; it is protected by a massive “bubble” called the heliosphere, created by the solar wind streaming from the Sun. This magnetic shield stretches far beyond the orbit of Pluto, acting as a cosmic barrier that deflects high-energy interstellar radiation. As the Sun travels through the galaxy, this bubble pushes against the interstellar medium, defining the true boundary where our star’s influence ends and the rest of the Milky Way begins.