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Celestial Groupssolar system | star system | galaxy | cluster (or group) of galaxies | supercluster | universe | observable universe |
| | DefinitionsSun and everything that orbits it (planets, dwarf planets, sssbs, etc.). Refers to our own star system and others | Star(s) and any planets and other materials that orbit it | Great gathering of stars all held together by gravity and orbiting a common center (contains from a few hundred million to a trillion) | Collection of galaxies bound together by gravity. Small ones (few dozen) are groups, while larger ones are clusters | Gigantic region of space packed closely together with galaxies, galaxy groups, and galaxy clusters | Sum total of all matter and energy (all galaxies+everything between them) | Portion of entire universe that can be seen from Earth (at least in principle) |
| | ExamplesOur Solar System ("Sol") | Our Solar System ("Sol") | Milky Way | Local Group | Local Supercluster |
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