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Astronomy and cosmology from "summary" of The Magic of Reality by Richard Dawkins
Astronomy is the study of everything in the night sky, while cosmology is the study of the universe as a whole. Astronomers have observed that the universe is expanding, which suggests that it must have started off very small and then grown over time. This idea is known as the Big Bang theory. One piece of evidence for the Big Bang theory is the cosmic microwave background radiation, which is a faint glow that fills the entire sky. This radiation is leftover from the early stages of the universe when it was very hot and dense. Another piece of evidence is the fact that galaxies are moving away from each other at a speed that is proportional to their distance - a relationship kno...
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