The bulk of all galaxies is primarily composed of dark matter. While gas and dust are important components, especially in the context of star formation and galactic structure, dark matter makes up the majority of a galaxy's mass. Estimates suggest that dark matter accounts for about 85% of the total mass of galaxies, with stars and baryonic matter (which includes gas and dust) constituting the remaining fraction.
Galaxy types quick check which component it makes up the bulk of all galaxies gas dust dark matter starts
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