Na galassia é metüda adöm da stëres, sistems, masses y grups de stëres, gas, polbri (che formëia le medium interstelar) tignis adöm dala forza de gravité.
La parora “galassia” vá zoruch al grech γαλαξίας (galaxìas), che ó dí "dl lat" y fej referimënt ala “Strada dl lat” pro chëra che al alda le sistem dl sorëdl. Al é galassies de deplü dimenjiuns, da chëres nanes a chëres metüdes adöm da miliarc de stëres y de deplü formes, danter chëres che al é: - galassies elittiches - galassies spirales - galassies cun formes nia regolares.
Tl univers che an pó osservé dala Tera él deplü co 100 miliarc de galassies.
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