astronomy A relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit.

Roget 268: traveler, wayfarer, voyager, itinerant, passenger, commuter.    tourist, excursionist, explorer, adventurer, mountaineer, hiker, backpacker, Alpine Club; peregrinator^†, wanderer, rover, straggler, rambler; bird of passage; gadabout, gadling^†; vagrant, scatterling^†, landloper^†, waifs and estrays^†, wastrel, foundling; loafer; tramp, tramper; vagabond, nomad, Bohemian, gypsy, Arab^†, Wandering Jew, Hadji, pilgrim, palmer; peripatetic; somnambulist, emigrant, fugitive, refugee; beach comber, booly^†; globegirdler^†, globetrotter; vagrant, hobo [U.S.], night walker, sleep walker; noctambulist, runabout, straphanger, swagman, swagsman [Austral.]; trecker^†, trekker, zingano^†, zingaro^†.    runner, courier; Mercury, Iris, Ariel^†, comet.    pedestrian, walker, foot passenger; cyclist; wheelman.    rider, horseman, equestrian, cavalier, jockey, roughrider, trainer, breaker.    driver, coachman, whip, Jehu, charioteer, postilion, postboy^†, carter, wagoner, drayman^†; cabman, cabdriver; voiturier^†, vetturino^†, condottiere^†; engine driver; stoker, fireman, guard; chauffeur, conductor, engineer, gharry-wallah^†, gari-wala^†, hackman, syce^†, truckman^†.    ... show more

Roget 318: world, creation, nature, universe; earth, globe, wide world; cosmos; kosmos^†; terraqueous globe^†, sphere; macrocosm, megacosm^†; music of the spheres.    heavens, sky, welkin^†, empyrean; starry cope, starry heaven, starry host; firmament; Midgard; supersensible regions^†; varuna; vault of heaven, canopy of heaven; celestial spaces.    heavenly bodies, stars, asteroids; nebulae; galaxy, milky way, galactic circle, via lactea [Lat.], ame no kawa [Jap.].    sun, orb of day, Apollo^†, Phoebus; photosphere, chromosphere; solar system; planet, planetoid; comet; satellite, moon, orb of night, Diana, silver-footed queen; aerolite^†, meteor; planetary ring; falling star, shooting star; meteorite, uranolite^†.    constellation, zodiac, signs of the zodiac, Charles's wain, Big Dipper, Little Dipper, Great Bear, Southern Cross, Orion's belt, Cassiopea's chair, Pleiades.    colures^†, equator, ecliptic, orbit.    [Science of heavenly bodies] astronomy; uranography, uranology^†; cosmology, cosmography^†, cosmogony; eidouranion^†, orrery; geodesy etc. (measurement) 466; star gazing, star gazer^†; astronomer; observatory; planetarium.    ... show more

Dutch: staartster, komeet
Polish: kometa