Voyager 2 confirms Neptune’s rings on August 22 in 1989

NASA's Voyager 2 spacecraft captured photographic evidence confirming the existence of Neptune's rings on August 22, 1989. At the time, the spacecraft was nearing its closest approach to Neptune, which occurred on August 25, 1989. This historic flyby provided the first visual proof of the planet's faint, continuous ring system, which had been theorized since the late 1980s due to observations of Neptune's occultation of a distant star.

The rings, named Adams and Le Verrier in honor of the astronomers who independently calculated Neptune's position, were later joined by three additional rings: Galle, Lassell, and Arago, along with four prominent ring arcs. Voyager 2 remains the only spacecraft to have visited Neptune, offering unique insights into the planet's ring system that have been corroborated by subsequent observations from Earth-based and space-based telescopes.