Hello Ella,

Imagine that black holes are actually another universes. The mass that it gets from outside becomes powder clouds which reshapes back to starts, galaxies and etc. In this case, there comes some assumptions to make. The gravity of a black hole is homogeneous inside the black hole. But because the gravitational difference between inside and outside of black hole is so high, the edge of black hole is a pulling force to outside and pushing force to inside. In this case, white holes are actually not holes. White holes are the edge of black holes which are observed from inside of the black hole. We know that we cannot move faster than the growth of universe so that we can get out of it. What if the universe is not growing faster than light but it just behaves as a white hole at the edge. That becomes the reason that we cannot get out of it.