Seminary: I m studying the void

What is the "void" in the world of super seminary Zhixin used "heaven and earth" to calculate that even if Carl spent more than 10000 stars, he could not calculate what it would be like to develop his brain to 60% but Carl does believe that there were people in the universe who exceeded the development of angel brains 10 billion years ago, so... Who are they when Xia Xue came to this world, an experiment seemed to touch the "void"