extragalactic nebula
English Thesaurus
1. (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust (noun.group)
| hyponym | : | spiral galaxy, spiral nebula, |
| definition | : | a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center (noun.group) |
| hyponym | : | great attractor, |
| definition | : | a massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the paths of other galaxies (noun.object) |
| hyponym | : | milky way, milky way galaxy, milky way system, |
| definition | : | the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky (noun.object) |
| instance hyponym | : | magellanic cloud, |
| definition | : | either of two small galaxies orbiting the Milky Way; visible near the south celestial pole (noun.object) |
| member holonym | : | star, |
| definition | : | (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior (noun.object) |
| substance holonym | : | cosmic dust, |
| definition | : | clouds of particles or gases occurring throughout interstellar space (noun.phenomenon) |
| domain category | : | astronomy, uranology, |
| definition | : | the branch of physics that studies celestial bodies and the universe as a whole (noun.cognition) |
| derivation | : | galactic, |
| definition | : | of or relating to a galaxy (especially our galaxy the Milky Way) (adj.pert) |
| derivation | : | galactic, |
| definition | : | of or relating to a galaxy (especially our galaxy the Milky Way) (adj.pert) |
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