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Vulcan (in astronomy)

Vulcan, in astronomy, hypothetical planet whose existence was proposed by Leverrier to explain part of the advance of the perihelion of Mercury, not all of which could be accounted for by gravitational effects of the other planets under the Newtonian theory of gravitation. The general theory of relativity explains the observed advance of the perihelion of Mercury as being caused by the curvature of space in the vicinity of the sun as a result of the sun's large mass.

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Vulcan

Vulcan (Volcanus) Roman god of fire and volcanoes, identified with the Greek god Hephaestus. His temples were prudently sited outside city walls. Often invoked to avert fires, he was associated with thunderbolts and the Sun.

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Hephaestus

Hephaestus •cactus • saltus • Diophantus • Sanctus •Rastus, Theophrastusaltostratus, cirrostratus, nimbostratus, stratus •conspectus, prospectus •momentous, portentous •asbestos, Festus •apparatus, Donatus, hiatus, status •acetous, boletus, Cetus, Epictetus, fetus, Miletus, quietus •Hephaestus •Benedictus, ictus, rictus •Quintus • linctus • eucalyptus • cistus •coitus •circuitous, fortuitous, gratuitous •Hippolytus • calamitous • tinnitus •Iapetus • crepitus •precipitous, serendipitous •impetus • emeritus • spiritous •Democritus, Theocritus •Tacitus • necessitous •duplicitous, felicitous, solicitous •covetous •iniquitous, ubiquitous •detritus, Heraclitus, Polyclitus, Titus, Vitus •Pocahontas, PontusPlautus, tortoise •cobaltous •Duns Scotus, lotus •hostess •arbutus, Brutus •Eustace • conductus • cultus •coitus interruptus • Augustus •riotous • Herodotus • Oireachtas

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Vulcan

Vulcanblacken, bracken, slacken •Sri Lankan •Alaskan, Gascon, Madagascan, Nebraskan •Aachen, darken, hearken, kraken, Marcan, Petrarchan •Interlaken •beckon, Deccan, pekan, reckon •Mencken •awaken, bacon, betaken, forsaken, Jamaican, mistaken, partaken, shaken, taken, waken •godforsaken •archdeacon, beacon, Costa Rican, deacon, Dominican, Mohican, Mozambican, Puerto Rican, weaken •quicken, sicken, stricken, thicken, Wiccan •silken •Incan, Lincoln •brisken, Franciscan •barbican • Rubicon • Gallican •Anglican •Helicon, pelican •basilican, Millikan, silicon •publican • pantechnicon • Copernican •African • American • hurricane •lexicon, Mexican •Corsican • Vatican • liken •Brocken, Moroccan •falcon, Lorcan, Majorcan, Minorcan •Balcon, Balkan •gyrfalcon •awoken, bespoken, betoken, broken, foretoken, oaken, outspoken, plain-spoken, ryokan, spoken, token, woken •heartbroken •Lucan, toucan •Saarbrücken • Buchan • Vulcan •drunken, Duncan, shrunken, sunken •Etruscan, molluscan (US molluskan), Tuscan •Ardnamurchan • lochan

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