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Where is the edge of the Universe

 
 
Reply Thu 16 Apr, 2020 06:04 pm
As far as we can tell, there is no edge to the universe. Space spreads out infinitely in all directions. Furthermore, galaxies fill all of space through-out the entire infinite universe. This conclusion is reached by logically combining two observations. First, the part of the universe that we can see is uniform and flat on the cosmic scale. The uniformity of the universe means that galaxy groups are spread out more or less evenly. The flatness of the universe means that the geometry of space-time is not curved or warped on the cosmic scale. This means that the universe does not warp around and connect to itself like the surface of a sphere, which would lead to a finite universe. The flatness of the universe is actually a result of the uniformity of the universe, since concentrated collections of mass cause space-time to be curved. The only way for the Universe to be flat and uniform literally everywhere is for the universe to be be infinite and have no edge. If you flew a spaceship in a straight line through space forever, you would never reach a wall, a boundary, an edge, or even a region of the universe without galaxy groups. Since our. observable universe is not infinite it has an edge. The universe as a whole is infinite and has no edge. The edge of our observable universe cannot keep up with the expansion of the universe so that many galaxies are eternally beyond our observation. The expansion of the universe is continuing at a rate faster than the speed of light.
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