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Nebulae are primarily formed by two factors: the remnants of dying stars and the accumulation of interstellar gas and dust. When a massive star exhausts its nuclear fuel, it can explode in a supernova, dispersing its material into space, which then cools and condenses to form a nebula. Additionally, regions of space with high concentrations of gas and dust can collapse under their own gravity, leading to the formation of a nebula. These processes contribute to the cycle of star formation and the evolution of galaxies.

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