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I mean, you could always replace rocket fuel with solar energy, which you can find plenty of in space.
That is an excellent idea. However, space travel is currently limited by rocket fuel, which is expensive and quite heavy, making endless travel nearly impossible.
https://www.forbes.com/sites/startswithabang/2021/12/30/how-far-could-a-spaceship-go-if-we-never-ran-out-of-thrust/?sh=1408616c29ee