In this diagram, time passes from left to right, so at any given time, the Universe is represented by a disk-shaped “slice” of the diagram.
Our universe began about 13.81 billion years ago. That we know this is a testimony to the power of science. It is truly an astonishing discovery and we are the first living people who have ever known this. Cosmology is speculative as to what happened before then, but competing ideas include that: Continue reading The Origin, Evolution, and Fate of the Cosmos