Just beyond the reach of charged particles from our Sun (which is, in some ways, the edge of our solar system), the Voyager spacecraft have witnessed a previously-unseen phenomenon for the first time. The pair of Voyager spacecraft, launched from Earth in 1977, are now in the shallows of interplanetary space. Despite being launched four decades ago, this pair of robotic explorers is still making new discoveries, as they traipse through uncharted territory. “The Voyager 1 (V1) and Voyager 2 (V2) spacecraft were launched in 1977 on a mission to explore the outer planets and reach the heliopause, the boundary between…
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