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nebula colorful smoke fire universe space celestial body nature beautiful spectacular fantasy mystery exploration discovery mystery unknown infinite eternal cycle continuous change development evolution time space matter energy conservation conversion origin of the universe big bang black hole white hole wormhole dark matter dark energy string theory M-theory quantum mechanics relativity physics astronomy science mystery exploration discovery unknown infinite eternal cycle continuous change development evolution time space matter energy conservation conversion origin of the universe big bang black hole white hole wormhole dark matter dark energy string theory M-theory quantum mechanics relativity physics astronomy