Assuming that the density of galaxies is ng galaxies per unit volume and a typical diameter of a galaxy is dg, what would the radius of the Universe need to be in order for each line of sight to intersect a galaxy?
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Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand. ... In places like space, where there is no atmosphere, there is no sound. Let's look at the example of a stereo speaker.