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> it's very hard to imagine interstellar travel being feasible with our current understanding.

Even with massive advancements in tech, and getting close to the speed of light, interstellar travel will be a lot of "one way heading into the unknown forever" kind of initiative. Interstellar empires only work with truly sci-fi tech that mostly ignores distances, like in sci-fi (instant subspace comms or warp travel with no relativistic effects)

This will never be the same kind of age of exploration as when we crossed the oceans and explored our planet. The scales are so mind blowing that even the fastest speed known to mankind is too slow. The times and distances involved to move and even just send signals (both ways!) and relativistic effects means at best we can "seed" a distant planet and hope that turns into a new (human?) civilization, forever separated from us for all practical purposes.