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Magnetic bubbles may mean Voyager 1 has left the Solar System

Leaving the Solar System is like leaving any familiar territory without maps — you have no idea what’s coming next, or even what you’ve just journeyed through. Such is the fate of NASA’s Voyager 1 spacecraft, which, at 18.7 billion kilometres from the sun, has been flirting with the edge of interstellar space for the past year. Conflicting data from its various experiments suggest that it both has and hasn’t left the Solar System. 


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