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Interplanetary medium
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==Extent of the interplanetary medium== The outer edge of the [[heliosphere]] is the boundary between the flow of the solar wind and the [[interstellar medium]]. This boundary is known as the [[Heliopause (astronomy)|heliopause]] and is believed to be a fairly sharp transition of the order of 110 to 160 [[astronomical unit]]s from the Sun. The interplanetary medium thus fills the roughly spherical volume contained within the heliopause.
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