Assertion: heliosphere | /r/HasProperty | observed by voyager
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text: Researchers said Voyager 2 also confirmed the existence of a “magnetic barrier” at the outer edge of the heliosphere that had been predicted by theory and observed by Voyager 1.
text: Their result (Nature Astronomy, "The bubble-like shape of the heliosphere observed by Voyager and Cassini") was just as controversial as the croissant.