Galaxy

Galaxy

Galaxy

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 , literally “milky”, a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion (10^9) stars to giants with one hundred trillion (10^14) stars, each orbiting its galaxy’s center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral and irregular.

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