What ETs have in common is that they all visit the nano world to travel long distances, and possibly spaceships to do stellar travel. It wouldn't be convenient for any star race just to travel through space without using stargates, intergalactic highways, or black holes -- the distances are too enormous.

What ETs have in common is that they all visit the nano world to travel long distances, and possibly spaceships to do stellar travel. 

It wouldn't be convenient for any star race just to travel through space without using stargates, intergalactic highways, or black holes -- the distances are too enormous. 

It would take too long. So bottom line is that we humans need to learn how to do this, too, before we can reach the stars, or we'll be homebound until we do. Billions of dollars of tax money and the black budget is invested in nano technology these days, and learning how to nano travel is the main reason. The upper echelon of the Global Elite knows that those who control the nano world control the Universe. Still, we need to learn how to travel without technology, or almost without technology, or we'll be limited.