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Fun fact about lore?
During the start of the intergalactic era, fossil fuels became dangerously scarce and the spaceships that were being built at the time were some crazy gas guzzlers, so there was a drastic crash in intergalactic travel for a few years as new technology was developed
Now, biofuel and liquid hydrogen (hydrogen fuel cells is an experimental fuel being currently worked on) are the most commonly used fuels. Fossil fuels still exist, but those that use them are considered old timey and classic, which a few love but a lot hate.
Also, liquid hydrogen systems require a nuclear core to power. The liquid hydrogen is injected into the core to create a chemical reaction which will boost the ship forward. Ships using these systems are either bi-system ships (paired with electricity, typically) or large scale cargo ships