I just (massively) zoomed in on a planet for some reason and noticed something about the streams of black blobs travelling between the structures/cities/thingies on the surface of planets:
When you look closely at them, they are very small, black tinted, versions of the models in the game, and not just the ships. I saw Vasary battleships, frigate shipyards and even a tiny Novalith zoom by. (the planet was Advent, incidentally)
Just a small fun fact I felt like sharing, don't think it's common knowledge yet.