In 1964 Gary Flandro of JPL noted that an alignment of Jupiter, Saturn, Uranus, and Neptune would occur in the late 1970s. This alignment happens once every 175 years. A single spacecraft could visit all of the outer planets by using gravity assists. President Nixon gave White House support to the concept in a statement released on March 7, 1970. Budget cuts and funding altered the trajectory of two spacecraft to complete the explorations.
Voyager 1 was launched on September 5, 1977. It began photographing Jupiter in January 1979 and encountered Saturn in November 1980. Voyager 1's mission included a flyby of Titan, Saturn's largest moon. After leaving Saturn Voyager 1 continued on to intersteller space. She reported scientific data to JPL until November 2023. Now over fifteen billion miles from Earth an evaluation was made and alternate solutions were used to "fix" it five months later. Traveling at about 38,000mph, 17 km/s (11 mi/s), Voyager is still on its way OUT of our solar system. A radio signal takes 22 hours each way. Read how JPL got it to work again:
https://www.jpl.nasa.gov/news/nasas-voyager-1-resumes-sending-engineering-updates-to-earth