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On June 15, 2011, the distance to the interstellar medium was recalculated, which is now believed to be much less than previously thought. NASA believes that Voyager 1 may cross into the space between the stars sometime in the next year or so. The Low Energy Charged Particle device on Voyager 1 has detected the outward flow of the solar wind to be at zero. This means it is flowing parallel up and down to the sun, signaling that the interstellar medium is very close. Voyager 2 still has more travel time before it reaches the interstellar medium, while scientists believed Voyager 1 will enter interstellar space "at any time".
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