What would a semi-realistic thruster for a spaceship be, using fuel from stars or debris around a black hole?

I'm designing a world in which starships have renewable energy, refueled by parking around black holes or stars and recharging batteries with solar panels, but what fuel for an engine could be extracted from these astral bodies, and what type of engine could be designed to accept that fuel?

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What would a semi-realistic thruster for a spaceship be, using fuel from stars or debris around a black hole?

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