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A galaxy is a vast, gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. Galaxies come in a variety of shapes and sizes and are the fundamental building blocks of the universe on large scales. They are held together by the force of gravity. Here are some key characteristics of galaxies: Stars: Galaxies contain a large number of stars, ranging from millions to billions or even trillions. These stars can vary in age, size, and color. Stellar Remnants: Galaxies also contain stellar remnants like white dwarfs, neutron stars, and black holes, which are the end stages of certain types of stars. Interstellar Medium: Galaxies have an interstellar medium composed of gas and dust that fills...