![]() Le Verrier, which is about 110 km (70 miles) in radial width, closely resembles the nonarc regions of Adams. The other five known rings of Neptune- Galle, Le Verrier, Lassell, Arago, and Galatea, in order of increasing distance from the planet-lack the nonuniformity in density exhibited by Adams. Consequently, it is suspected that the event that supplied the material for Adams’s enigmatic arcs-perhaps the breakup of a small moon-occurred within the past few thousand years. Although the moon Galatea, which orbits just planetward of the inner edge of Adams, may gravitationally interact with the ring to trap ring particles temporarily in such arclike regions, collisions between ring particles should eventually spread the constituent material relatively uniformly around the ring. They range in length from about 1,000 km (600 miles) to more than 10,000 km (6,000 miles). From leading to trailing, the most prominent are named Courage, Liberté, Egalité 1, Egalité 2, and Fraternité. The arcs are found within a 45° segment of the ring. Although rings also encircle each of the other three giant planets, none displays the striking clumpiness of Adams. The putative arcs turned out to be bright regions in the outermost ring, named Adams, where the density of ring particles is particularly high. Images from Voyager 2, however, revealed a system of six rings, each of which in fact fully surrounds Neptune. Jet Propulsion Laboratory/National Aeronautics and Space Administration Adams's bright arcs are absent from the combined image because they were on the opposite side of the planet when the separate photographs were taken. The innermost ring, Galle, appears as a faint diffuse band between Le Verrier and the overexposed crescent of Neptune. Spreading halfway to Adams from Le Verrier is the diffuse ring Lassell, whose somewhat brighter outer edge constitutes the ring Arago. The two brightest rings are Adams, the outermost ring of the system, and Le Verrier. Neptune's ring system, captured by Voyager 2 in two long-exposure backlit images made a few hours after the spacecraft's closest approach to the planet in August 1989. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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