“If you want a gleam in a scientist's eye, that’s it for me. Uranus and Neptune orbiters and an interstellar probe,” Gurnett says. Voyager, though it’s still pushing further out of the solar system, will likely run out of power before it escapes its influence. A probe dedicated to exploring the space between the stars might have more luck, if the next generation of rocket engineers can figure out how to get those spacecraft out there. Gurnett notes that those future explorers would have to make a longterm commitment to see the project through. After a lifetime dedicated to space exploration, he knows a thing or two about what that commitment looks like.