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ON THE EDGE. Artist's conception of location of the two Voyager spacecraft within the vast bubble of charged particles known as the heliosphere. This bubble, blown out by the solar wind, defines the extent of the solar system. The bubble contracts or expands as the solar wind varies in strength. The termination shock (purple) marks the region where the solar wind is slowed abruptly by pressure from gas between the stars. Credit: W. Feimer/NASA
Found in: Planetary Science

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