There isn’t “edge of the universe.” The universe is infinite but expanding. Imagine a loaf of raisin bread of infinite size, but where the space between the raisins is getting ever larger.
Your teachers were mad because you didn’t understand the basics.
“There isn’t “edge of the universe.” The universe is infinite but expanding. Imagine a loaf of raisin bread of infinite size, but where the space between the raisins is getting ever larger.”
I have heard that one too. The loaf of bread, its edges, still has to have somewhere to expand, first against the sides of the pan and then up. You can’t figure that out?