Edwin Hubble Famous Quotes

The sphere to end all spheres—the largest and most perfect of them all—is the entire observable universe. In every direction we look, galaxies recede from us at speeds proportional to their distance. As we saw in the first few chapters, this is the famous signature of an expanding universe, discovered by Edwin Hubble in 1929. When you combine Einstein’s relativity and the velocity of light and the expanding universe and the spatial dilution of mass and energy as a consequence of that expansion, there is a distance in every direction from us where the recession velocity for a galaxy equals the speed of light. At this distance and beyond, light from all luminous objects loses all its energy before reaching us. The universe beyond this spherical “edge” is thus rendered invisible and, as far as we know, unknowable. There’s a variation of the ever-popular multiverse idea in which the multiple universes that comprise it are not separate universes entirely, but isolated, non-interacting pockets of space within one continuous fabric of space-time—like multiple ships at sea, far enough away from one another so that their circular horizons do not intersect. As far as any one ship is concerned (without further data), it’s the only ship on the ocean, yet they all share the same body of water.

in 1931 Edwin Hubble invited Einstein to the observatory of the Hooker Telescope near Pasadena, California, and showed him that, in fact, the universe was expanding. Einstein then pronounced one of his most famous sentences: “Now I see the necessity of a beginning,” a lofty phrase followed by another equally famous but more earthly remark, “That was the biggest blunder of my whole life,”113 referring to the gravitational constant that he had devised in order to adjust the Theory of Relativity. In an ironic twist, the gravitational constant then proved to exist, although not in the magnitude that Einstein attributed to it. We will see this further on.