A galaxy is a huge gravitationally-bound system of stars, interstellar gas and dust, all orbiting a common center of gravity. There are many galaxies in the known universe, but they are widely separated (often by millions of light-years).
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In Nova, "the known galaxy" refers to the tiny subset of our own galaxy that humans have been able to explore. While it may seem that Sol is the center of the galaxy (and there are many people who wish it were so), it is actually located near the outer edge. However, the known galaxy has Sol in the center, because humanity has been exploring away from its starting point (Sol), and hasn't even come near any edges of the galaxy yet.