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The universe is a vast whole that expands in dimensions of time and space, had a beginning, but whose boundaries are not precisely known, and contains billions of galaxies. The Boundary Open to the Sky: How Much of the Universe Can We See? Since its existence, humanity has looked to the sky and questioned its place in the universe. As our observations have advanced, we have come to realize that we can directly observe only a small portion of the universe. This visible part is scientifically defi