extragalactic nebula | | |
n. (group) | 1. extragalactic nebula, galaxy | (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust.; "`extragalactic nebula' is a former name for `galaxy'" |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ aggregation, collection, accumulation, assemblage | several things grouped together or considered as a whole. |
| ~ spiral galaxy, spiral nebula | a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center. |
| ~ great attractor | 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. |
| ~ magellanic cloud | either of two small galaxies orbiting the Milky Way; visible near the south celestial pole. |
| ~ milky way, milky way galaxy, milky way system | 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. |
| ~ star | (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior. |
| ~ cosmos, macrocosm, universe, world, existence, creation | everything that exists anywhere.; "they study the evolution of the universe"; "the biggest tree in existence" |
| ~ cosmic dust | clouds of particles or gases occurring throughout interstellar space. |
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