A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
The word galaxy is derived from the Greek “galaxias”. Galaxies range in size from dwarfs with just a few hundred million stars to giant systems with one hundred trillion stars.
Each of the stars in a galaxy orbits its galaxy’s center of mass.
The majority of galaxies are gravitationally organized into groups, clusters, and superclusters.
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