November’s Night Sky Notes: Light-Day Away
Image: NASA
Machine-written summary, checked against the sources below
NASA launched the twin Voyager 1 and 2 spacecraft in 1977, timed to a planetary alignment of Jupiter, Saturn, Uranus, and Neptune that occurs only once every 175 years. Using six gravity assists between the two probes, the Grand Tour produced close-up views of the gas and ice giants and several of their moons.
Twin Travelers In 1977, NASA launched twin spacecraft Voyager 1 and 2, taking advantage of a once-every-175-year planetary alignment of the four largest planets in our solar system: Jupiter, Saturn, Uranus, and Neptune. Using six gravity assists between them, this Grand Tour gave us up-close views of the gas and ice giants, including several moons. […]
Summary by NASA, the primary source