The discovery that the Universe is expanding, though unexpected, was not a complete surprise. General relativity had been known to allow this as one of several possibilities since Einstein wrote down ...The discovery that the Universe is expanding, though unexpected, was not a complete surprise. General relativity had been known to allow this as one of several possibilities since Einstein wrote down his equations in 1916. In this final chapter, we will explore how we have come to understand the changes in the expansion rate of the Universe over time, and what that might say about its future.
