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Stupidly large numbers. If we all went exploring on our own, we’d each have about 200-300 galaxies to cover. A lifetime at 2-4/y.,Kinda interesting that most space opera limits itself to one galaxy. The universe is too big even to fictionally comprehend.
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The Hubble Ultra Deep Field led to an estimate that the observable universe contained at least 200 billion galaxies. But a research from 2016 suggests that number is at least 10 times too low leading to a total of 2 trillion (2,000,000,000,000) galaxies: go.nasa.gov/3s40UOR
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Once upon a time, in a galaxy right here, there were too many possible worlds to colonize, so I focused on the world I've got, and there was still too much to enjoy.
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