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Voyager 1 has traveled far, offering a privileged and unprecedented insight into the universe beyond our own.

In 1977, NASA launched the Voyager 2 spacecraft to visit the planets Jupiter, Saturn, Uranus and Neptune. After completing

"Previously, to measure the density you had to wait for a so-called plasma oscillation event, a finite burst of plasma activity that's triggered by solar activity like coronal mass ejections which send shock waves out into the interstellar medium," she said. "Now, we can measure the plasma density in the absence of these plasma oscillation events, allowing us to trace underlying properties of the plasma and see how the plasma is responding to these shock waves from the Sun. This work gives us the most complete map of the plasma along Voyager 1's trajectory to date." The original plan for the ...