An “event horizon” of a black hole is a hypothetical membrane that denotes the barrier beyond which infalling light and matter cannot escape. The Sun‘s event horizon, which cannot exist because it is too small, would be only six kilometres wide.
Although no one knows why, the greatest supermassive black holes, which are tens of billions of times more massive than the Sun, are found at the cores of all galaxies. These supermassive black holes have event horizons that are bigger than the Solar System.
If you crossed over the event horizon and entered inside a black hole, time would transform into space and vice versa. You can’t avoid the horrifying infinite-density “singularity” that lurks like a black widow spider at the core of a black hole since it no longer exists throughout space but rather across time. You can’t avoid it any more than you can avoid tomorrow because it will happen.
Some assume that what lies on the other side of the singularity is a portal to distant portions of our Universe or possibly other universes. The fact is that a singularity in a theory indicates the theory’s collapse and the point at which it has nothing more sensible to say.
We will need a stronger theory of gravity than Einstein’s – a ‘quantum’ theory of gravity – to really comprehend what occurs at the centre of a black hole and whether the query ‘What’s on the other side?’ is a meaningful one. Finding one of them is one of science’s most difficult tasks! (Sciencefocus)
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