In 1972, NASA began a mission that would take advantage of a rare alignment of the planets that would make it possible to visit all four outer planets. In August and September of 1977, Voyager 1 and 2 were launched into space.

September 5, 2017 marks the 40^th anniversary of the launch of Voyager 1, now the first man-made object in Interstellar Space. Its twin, Voyager 2 (launched August 22), currently traverses the Heliosheath. Since their launches in 1977, Voyager 1 and 2 have collected data from Jupiter, Saturn, Uranus, Neptune and the many moons that orbit the four planets. Included in the data are breath taking pictures and a family portrait of the planets in our solar system.

• Learn more about the Voyager spacecraft from NASA.
• Listen to the sounds of Interstellar Space.
• Voyager has taken thousands of pictures of space. View these and others in NASA’s Photojournal.
• Check out books about Voyager’s findings and space travel.
• Stream video created based on Voyager’s findings.
• Watch Voyager: Journey to the Stars for a summary of Voyager’s ongoing 40-year space expedition.