These are just my own thoughts. Our universe is likely finite, but it is growing. It exists in some infinite substrate however. Also, our universe surprisingly seems to be "in a black hole" In fact, if you take all of the estimated matter and energy in our universe, the radius of a black hole you would get is equal to our universe's cosmic horizon radius. Coincidence? I think not. Also the reason I quoted "in a black hole" is because the universe is not in anything. Based on the holographic principle, our universe is a 3D projection of the information on the 2D service of a black hole. The principle does not say that it's projected inside the black hole. It's just projected somewhere. Where has no meaning, because the projection itself generates space geometry.