how do we know dark energy exists

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Dark energy exists because much of the observed and visible universe behavior cannot be explained with visible matter or energy. Visible matter and energy does not account for the much of the phenomina exist around our universe. Concept of dark energy is missing gravity that prevents galaxies from flying off. It account from missing mass of 80% of the universe. It accounts for defying predition of big bang. Universe is not uniform as big bang predicted.

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