Possible - sure. But the default state should be to assume FTL aliens would need to refuel. Consider human civilisation circa 3000 years ago. People moved arou

Possible - sure. But the default state should be to assume FTL aliens would need to refuel. Consider human civilisation circa 3000 years ago. People moved around on horses, with carts. Roads were usually poor or non-existent. We are incomparably advanced compared to back then. But: • They had outposts for travellers and we have airports. • They had to feed their horses, we have to refuel planes. • They needed infrastructure to establish new towns and colonies. We do too although the Earth being inconveniently full of cities often hides this fact. Whilst the technology has changed enormously the fundamentals of travel and colonisation haven't. If there's no refuelling process at all ever then that implies a violation of the conservation of energy laws anyway - even if you only refuel once when a ship is newly built with some incredibly long lasting energy source, that's still fueling.