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Galaxies are immense systems of stars, gas, dust, and dark matter, each containing billions to trillions of stars, and are the building blocks of the universe.
Nebulae are vast clouds of gas and dust in space, where stars are born and planetary systems take shape through gravitational collapse and subsequent star formation processes.
Clusters refer to groups of celestial objects, such as stars, galaxies, or nebulae, bound together by gravitational forces within the vast expanse of the universe.