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Nothing is real.
It curves into four dimensions of space and time, producing bizarre objects like black holes. In the same way, the physical void is a central player in the universe. It's rich, juicy, endlessly fascinating. Currently, for example, astronomers think this emptiness is expanding like a cake in the oven, pushing distant galaxies off the edge of the universe. The absence of something is like lost keys, or a lost love, or a missing factor in an equation.