Question: What if a galaxy only has 1 sun and 1 planet an it is in the exact middle? – Lance
Answer: Galaxies are defined as collections of stars (possibly with planets), gas, and dust. A single sun with a planet would not really qualify as being a “galaxy”. What you are really describing would be considered a free-floating star and planet, which somehow ended-up outside the galaxy from which it formed. To my knowledge we have never seen such an object.