What's Going on in Star Wars?

When a light sabr hits another light saber daniel, is the light actually touching it itself? Is is it colliding? Or is that actually something that's impossible in the universe? Did george lucas make all that stuff up? You know, he has a huge budget, and so i'm sure he did all the arundi necessary to make sure that star wars is realistic. But actually, didn't star worts happen a long time ago, so in principle, all the stuff has already been developed. Yet, wa depends on who the movies for. The movie could be for aliens who are really far away, in which case it will have happened a long time