Heliosphere
Heliosphere :
A huge magnetic bubble containing the solar wind and the entire solar magnetic field. At the outermost boundary of the heliosphere, our solar wind meets the interstellar medium, a plasma that permeates our Milky Way galaxy. Scientists estimate that this boundary is between 9 and 15 billion kilometers away from the Sun, far beyond the orbits of all the planets. We should find out for certain sometime in this century when one or more spacecraft - Voyagers 1 and 2 and Pioneers 10 and 11 - leave the heliosphere and enter interstellar space.
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