- Black holes and white holes are amongst the most interesting concepts in theoretical physics.
- As the name suggests, they are opposites; while black holes' event horizons make escape impossible, white holes shoot everything out and let nothing in.
People like to think of black holes and white holes as gateways through the universe. You fall into a black hole, zoom across spacetime, and are flung out of a white hole at some distant location. It would be pretty nice if this was how physics actually worked (it could make intergalactic travel a whole lot easier).
But unfortunately, this isn’t exactly how it works.
White holes, to be clear, are entirely theoretical. As of this moment, we don’t have any evidence of their existence. In fact, most scientists think that they don’t exist. However, they are handy mathematical constructs that allow us to talk about the space surrounding a black hole in meaningful ways.
In short, if black holes can handle an incredible amount of mass, white holes deal with none at all. Theoretical models say that a white hole cannot be entered from the outside. This is, of course, the complete opposite of what we know black holes to be (supermassive objects that cannot be exited).
You can learn more by watching the video below: