Universe expanding since Big Bang from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
The idea that the universe has been expanding ever since the Big Bang is a central concept in modern cosmology. When we look out into space, we see that galaxies are moving away from us in all directions. This observation led scientists to conclude that the universe must be getting bigger. But what does it mean for the universe to be expanding? One way to think about it is to imagine the universe as a balloon being inflated. As the balloon expands, every point on its surface moves away from every other point. In the same way, as the universe expands, galaxies move away from each other. The expansion of the universe has important implications for our understanding of its past and future. If we run the clock backwards, we can infer that the universe was much smaller and denser in the past. Eventua...
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