Expanding from "summary" of The Disordered Cosmos by Chanda Prescod-Weinstein
At the heart of modern cosmology is the concept of expanding. Our universe is not static, but rather in a state of continual growth and evolution. It was Edwin Hubble who first noticed this expansion in the 1920s, leading to a revolutionary shift in our understanding of the cosmos. As we look out into the vast expanse of space, we see galaxies moving away from us, with their light stretched to longer wavelengths due to the expanding space between us. This expansion has profound implications for our understanding of the universe. It suggests that the universe has a history, a beginning - the Big Bang. This explosive event marked the birth of our universe, setting into motion the expansion that continues to this day. As we peer back in time, we see a universe that was denser, hotter, and more energetic - a far cry from the vast emptiness of space we see today. But the story of expanding is not just about the...
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