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| Description: Observable Universe This diagram shows why we only see part of the entire universe. As time passes, this volume grows, meaning that light from more distant galaxies reaches us. The farthest galaxies we see (inset) are as they were within a few hundred million years after the Big Bang. These galaxies, formed at the same time as the Milky Way, appear young because the light from their beginnings is just now reaching us. While the light from the most distant galaxies we see was traveling toward us, the universe has been growing. Therefore, objects that appear 13 billion ly away from us are actually about 3 times farther away today. Put another way, if we could see it all as it is today, rather than as it was when photons from distant objects started their journeys, the visible universe would be nearly 46 billion ly in radius. (Inset) This image shows some of the most distant galaxies we have seen. Picture Stats: Views: 628 Filesize: 189.82kB Height: 651 Width: 752 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18784 |