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Cake day: June 15th, 2023

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  • While I agree with you on the difficulty of cryogenic fuel storage and re-fueling in orbit, the ISS does actually have some of it’s own rocket thrusters. They’re on the Zvezda module and are re-fuelled by Progress vehicles. Relevant section from the Wikipedia article on Zvezda:

    The Service Module has 16 small thrusters as well as two large 3,070-newton (690 lbf) S5.79 thrusters that are 2-axis mounted and can be gimballed 5°. The thrusters are pressure-fed from four tanks with a total capacity of 860 kg. The oxidizer used for the propulsion system is dinitrogen tetroxide and the fuel is UDMH, the supply tanks being pressurised with nitrogen. The two main engines on Zvezda can be used to raise the station’s altitude. This was done on 25 April 2007. This was the first time the engines had been fired since Zvezda arrived in 2000.

    https://en.wikipedia.org/wiki/Zvezda_(ISS_module)