8 Theories About Reality That Make You Question Everything

6. Our Universe Could Be In A Black Hole

One for the first things you learn about astronomy is that the universe was created in the Big Bang, but what actually was it? Even the greatest scientific minds don't really know.

Another similarly mysterious cosmic object is the black hole, a point in spacetime so dense that eventually everything within it collapses down into a singularity. The problem with singularities, however, is they're more of a mathematical construct than a physical process, which leads us to wonder what actually happens at the point of singularity.

Some theories suggest that the black hole doesn't just completely collapse, but bounces back and begins to spew out everything in it. This model looks an awful lot like the Big Bang.

In a2010 paper by Nikodem Poplawski, the initial singularity of the Big Bang (which is actually a bit of a problem for physicists) is done away with altogether. This theory puts forward the idea that beyond the event horizon of a black hole, a finitely dense universe is created.

The formation of this universe is not observable from outside the event horizon, as the events within a black hole occur after infinite time, essentially creating a separate branch or "bubble" of spacetime.

How do we test the theory? Well, certain properties of our universe would be influenced by our "parent" black hole. By observing the spin of galaxies, we may just be able to detect these inherited qualities.