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The second hypothesis is that the rings were never part of a moon, but are instead left over from the original nebular material from which Saturn formed. [citation needed] A 2007 artist's impression of the aggregates of icy particles that form the 'solid' portions of Saturn's rings. These elongated clumps are continually forming and dispersing.
Saturn and its rings are best seen when the planet is at, or near, opposition, the configuration of a planet when it is at an elongation of 180°, and thus appears opposite the Sun in the sky. A Saturnian opposition occurs every year—approximately every 378 days—and results in the planet appearing at its brightest.
Fainter planetary rings can form as a result of meteoroid impacts with moons orbiting around the planet or, in the case of Saturn's E-ring, the ejecta of cryovolcanic material. [ 6 ] [ 7 ] Ring systems may form around centaurs when they are tidally disrupted in a close encounter (within 0.4 to 0.8 times the Roche limit ) with a giant planet.
Ring particles modifying Saturn’s upper atmosphere, changing its composition, scientists say. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...
Ring moonlets and shepherds, which orbit inside or close to Saturn's rings. A moonlet can only partially clear out dust in its orbit, [179] while the ring shepherds are able to completely clear out dust, forming visible gaps in the rings. [180] Inner large satellites Mimas, Enceladus, Tethys, and Dione. These satellites orbit within Saturn's E ...
Artist's conception of the giant impact thought to have formed the Moon. Jupiter and Saturn have several large moons, such as Io, Europa, Ganymede and Titan, which may have originated from discs around each giant planet in much the same way that the planets formed from the disc around the Sun. [88] [89] [90] This origin is indicated by the ...
Astronomers have long known about the perplexing spokes on Saturn’s rings, which look like apparitions skating along the rings and can be spotted in various locations depending on where the ...
A number of features in Saturn's rings are related to resonances with Mimas. Mimas is responsible for clearing the material from the Cassini Division, the gap between Saturn's two widest rings, the A Ring and B Ring. Particles in the Huygens Gap at the inner edge of the Cassini division are in a 2:1 orbital resonance with Mimas. They orbit ...