I didn't mean your question was ridiculous and I'm just messin' around. But I'm sure I don't have the answer to any of those questions you posed nor can I explain why the universe is seemingly endless and without boundaries.

If something comes from nothing then what is the source of said nothingness? Where do space and time come from?

Does one hit a brick wall at the end of the space-time continuum? Isn't there something on the other side of the wall and so forth?

Or is our universe one amongst many, like a marble piled on top of others in a bag? But then what's beyond the bag and who's holding it?

It all breaks down in the face of human logic, because isn't possible for the human mind to fully comprehend the infinite; it's simply greater than us and unattainable in this life form.