What is in the center of space

I am 15. I was thinking about space, and I couldn't stop, so I did research. I can't find any real results, so I wanted to ask you for some results. What is in the center of space? Due to the theory of red shift, when all of the galaxies are expanding and moving away from each other. That means they came from a starting point, which is when the big bang theory comes into play, my question is what is in the center of space, I only want theories, mine is that highly radioactive nebula's are producing massive stars, again I am only 15 so my guess isn't as educated as a NASA supervisor. With one more question. If space is expanding, what is on the end of space where space hasn't expanded? Because I have always believed that nothing is something but something isn't nothing. It makes sense, so there has to be something at the end of space, I know I will never find out, but I want to at least have an idea. Thank you :D :D :D :D :D :D :D :D

There is no center of space, just like there is no center of the surface area on an expanding ballon. The Big Bang created the universe, and there is no "outside the universe."

Quantum mechanics shows that "nothing," as a philosophical concept, does not exist. There is always a quantum field with random fluctuations.

There are many well-respected physicists, such as Stephen Hawking, Lawrence Krauss, Sean M. Carroll, Victor Stenger, Michio Kaku, Alan Guth, Alex Vilenkin, Robert A.J. Matthews, and Nobel laureate Frank Wilczek, who have created scientific models where the Big Bang and thus the entire universe could arise from nothing but a quantum vacuum fluctuation in the quantum field -- via natural processes.

I know that this doesn't make sense in our Newtonian experience, but it does in the realm of quantum mechanics and relativity. As Nobel laureate physicist Richard Feynman wrote, "The theory of quantum electrodynamics describes nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept nature as she is — absurd."