"So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist."
"One could say: "The boundary condition of the universe is that it has no boundary." The universe would be completely self-contained and not affected by anything outside itself. It would neither be created nor destroyed. It would just BE."
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Source: Stephen W. Hawking (2003). “The Illustrated Theory of Everything: The Origin and Fate of the Universe”, New Millenium
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