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The sun has an influence on its surroundings. One of these is in the form of small particles that are constantly ejected from the sun in all directions, which exerts an outward pressure, creating an expanding sphere of particles that moves away from the sun. These particles are the solar wind. As the shell of particles expands, the density (and pressure) falls. Eventually the solar wind reaches the interstellar medium — the space between the stars — which, despite not being very dense, is not em...