Heh! I can just see some sailors in the days of Sir Francis Drake, trying to imagine how a combustion engine or a turbine could work.... Good luck.

What if there are beings out there whose science is as far beyond us as ours is beyond that of the Dark Ages? What if they can easily visit a thousand or ten thousand worlds, and ours just doesn't rank all that high on the list of importance, but is worth a quick look at now and then?

What then?

I think our ability to even consider such things in an even-handed way is greatly hampered by our view of ourselves as the center of the Universe, and that, frankly, is how most people see it, whether they know it or not. Humanity is egocentric. We're like a bunch of beavers in a little isolated pond somewhere, with our silly little religions, our silly little political struggles, and our delusions of grandeur.