The boundary of the heliosphere.
- Both Voyagers are headed towards the outer boundary of the solar system in search of the heliopause, the region where the Sun's influence wanes and the beginning of interstellar space can be sensed.
- In a small side article, she notes that NASA's Voyager 2 spacecraft has passed the heliopause, the outermost edge of our solar system.
- Its last assignment was to find the heliopause, where the solar wind is offset by the galactic wind, but in April 1997 it was passed by a younger, faster Voyager spacecraft.
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