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A short history of nearly everythingБЂњSo far, fortunately,БЂ«writes Weinberg in Dreams of a Final Theory, БЂњwe do not seem to be coming to the end of our intellectual resources.БЂ«Almost certainly this is an area that will see further developments of thought, and almost certainly these thoughts will again be beyond most of us. While physicists in the middle decades of the twentieth-century were looking perplexedly into the world of the very small, astronomers were finding no less arresting an incompleteness of understanding in the universe at large. When we last met Edwin Hubble, he had determined that nearly all the galaxies in our field of view are flying away from us, and that the speed and distance of this retreat are neatly proportional: the farther away the galaxy, the faster it is moving. Hubble realized that this could be expressed with a simple equation, Ho = v/d (where Ho is the constant, v is the recessional velocity of a flying galaxy, and d its distance away from us). Ho has been known ever since as the Hubble constant and the whole as HubbleБЂ™s Law ...» |
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