Andromeda Initiative briefings (6/6 Golden Worlds and Settlements)

If theres gas giants out in deep space, that could explain the 600 year journey. Going in a straight line (ish) they'd be traveling rather slow compared to other ships in Milky Way galaxy travel at. Also wouldn't take long to refuel, I also don't think the core requires nearly as much as the thrusters. Anyway they'd be traveling at 11 light years per day instead of the 13-15 most ships go at. Sooo maybe they're traveling at more like 13 and they are making stops at gas giants or something or whatever floating out in deep space.

To be fair, they never actually explain what fuels the Eezo-Cores outside of electricity. Hydrogen fuel cells would make some sense (since that's still an electrical engine at that point, for cars anyway). But 'fueling' in ME2/3 was entirely for the thrusters, not the core. I always kinda assumed, since they never explained it outside of 'electricity!' that it was similar to a nuclear sub. It just needs water to keep running, doesn't really refuel during it's lifetime.

Which, granted, is only 25-ish years for a nuke-sub. Far cry from 600 year space journey. But I find it weird we'd be using an actual fuel source to power space ships systems. Thrusters I can understand, you need some kind of propellant and all that. But the electrical systems, the Eezo-core? There probably using something a bit more permanent. Little more long lasting then something that needs refueling every few days.

Then again like I mentioned, maybe it is hydrogen fuel cells for the eezo core and hydrogen based jet fuel for the thrusters. Would make sense I guess, just collect hydrogen and use it how you need it in whatever systems.