The Solar System’s Loneliest Planets, Revisited

By Shannon Hall On August 25, 1989, in Pasadena, Calif., NASA’s Jet Propulsion Laboratory was bustling with activity. Scientists, reporters and even a bona fide rock star, Chuck Berry, had flocked to the facility’s mission control to commemorate the moment the Voyager 2 spacecraft flew shy of 5,000 kilometers above Neptune’s north pole the previous …