If we just go by the dictionary definition. " galaxy ˈɡaləksi/
noun: galaxy; plural noun: galaxies
a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. synonyms: star system, solar system, constellation, cluster," --------- What has to be present for something to be called a galaxy ? would be a simplistic way of answering the OP.
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sj