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Dione (in astronomy)

Dione (dīō´nē), in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn IV (or S4), Dione is 695 mi (1,120 km) in diameter, orbits Saturn at a mean distance of 234,500 mi (377,400 km), and has an orbital period of 2.737 earth days—the rotational period is unknown but is assumed to be the same as the orbital period. It was discovered in 1684 by the Italian-French astronomer Gian Domenico Cassini. Aside from Titan, Dione is the densest of Saturn's satellites; it is believed to be composed primarily of water ice with a considerable fraction of denser material, such as silicate rock. The trailing hemisphere is more heavily cratered than the leading hemisphere, which is the reverse of the cratering on most of the other Saturnian satellites. Another moon, Helene, is co-orbital with Dione; that is, it orbits Saturn at the same distance as Dione, and precedes Dione by about 60°. Dione also forms a satellite pair with Enceladus; that is, the two moons interact gravitationally.

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Dione

Dione (Saturn IV) One of the major satellites of Saturn, with a radius of 560 km; mass 10.52 × 1020 kg; mean density 1440 kg/m3; visual albedo 0.7. It was discovered in 1684 by G. D. Cassini.

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Dione

Dione in Greek mythology, a Titan, the mother by Zeus of Aphrodite.

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Aphrodite

Aphroditealmighty, Aphrodite, Blighty, flighty, mighty, nightie, whitey •ninety • feisty •dotty, grotty, hottie, knotty, Lanzarote, Lottie, Pavarotti, potty, Scottie, snotty, spotty, totty, yachtie, zloty •lofty, softie •Solti • novelty •Brontë, démenti, Monte, Monty, Visconti •frosty •forty, haughty, naughty, pianoforte, rorty, shorty, sortie, sporty, UB40, warty •balti, faulty, salty •flaunty, jaunty •doughty, outie, pouty, snouty •bounty, county, Mountie •frowsty • viscounty •Capote, coatee, coyote, dhoti, floaty, goaty, oaty, peyote, roti, throaty •jolty •postie, toastie, toasty •hoity-toity • pointy •agouti, beauty, booty, cootie, cutie, Djibouti, duty, fluty, fruity, rooty, snooty, tutti-frutti

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Dione

Dionealone, atone, Beaune, bemoan, blown, bone, Capone, clone, Cohn, Cologne, condone, cone, co-own, crone, drone, enthrone, flown, foreknown, foreshown, groan, grown, half-tone, home-grown, hone, Joan, known, leone, loan, lone, moan, Mon, mown, ochone, outflown, outgrown, own, phone, pone, prone, Rhône, roan, rone, sewn, shown, Simone, Sloane, Soane, sone, sown, stone, strown, throne, thrown, tone, trombone, Tyrone, unbeknown, undersown, zone •Dione • backbone • hambone •breastbone • aitchbone •tail bone, whalebone •cheekbone • shin bone • hip bone •wishbone • splint bone • herringbone •thigh bone • jawbone • marrowbone •knuckle bone • collarbone •methadone • headphone • cellphone •heckelphone • payphone • Freefone •radio-telephone, telephone •videophone • francophone •megaphone • speakerphone •allophone • Anglophone • xylophone •gramophone • homophone •vibraphone • microphone •saxophone • answerphone •dictaphone •sarrusophone, sousaphone •silicone • pine cone • snow cone •flyblown • cyclone • violone •hormone • pheromone • Oenone •chaperone • progesterone •testosterone

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