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Celestial Groups
solar system |
star system |
galaxy |
cluster (or group) of galaxies |
supercluster |
universe |
observable universe |
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Definitions
Sun 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) |
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Examples
Our Solar System ("Sol") |
Our Solar System ("Sol") |
Milky Way |
Local Group |
Local Supercluster |
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