UNIVERSE INSIDE A BLACKHOLE

Does the Universe reside inside a black hole?

What do we know about the Universe? Seriously, what do you know about your own home? Most probably, very little - just like all of us. Many wrongly assume that the Universe is everything that surrounds us and beyond. This is a fair guess, but the problem is that saying 'the Universe is everything' is about the same as saying 'the Universe is nothing.'

Let's start from the beginning... What do we know about black holes? A black hole is a piece of space-time with enormously strong gravity. But what is gravity? Any massive body causes space-time to bend; the more it warps, the stronger the gravity. A black hole's gravity is so strong that it is absolutely impossible to escape it. There is a region around a black hole called the event horizon, a kind of a point of no return. Nothing can escape from the event horizon, no information at all; not even light can overcome its gravity. That's why, if you were to look at a black hole, it would seem, indeed, black.

Black holes usually emerge out of former stars. A star tries to shrink under the force of its own gravity, but the nuclear synthesis reactions inside it try to resist this process. By the moment the fuel for the synthesis runs out, a star either cools down and its gravity weakens, or it starts to collapse under the pressure of its own gravity before reaching the cooling stage. In this case, it will decrease in size, but its mass will remain unchanged - meaning that it will get denser. Following this scenario, a star should shrink to a point of infinite density, which is called a singularity. For each body, there is an intermediate limit called a gravitational radius: once an object's size gets smaller than its gravitational radius, the object turns into a black hole.

Here's some food for thought: the radius of our Universe equals roughly 4*10^26 metres, while its gravitational radius is around 5*10^ 27 metres, meaning that the actual radius of the Universe is much smaller than its gravitational radius. Now let's go back to the definition of a black hole as any object whose radius is less than its gravitational radius. Our Universe is exactly such an object. This theory does not contradict the Big Bang theory - quite the contrary, it supports it. Indeed, according to our main theory, the Universe before the Big Bang used to be a point of infinite density, i.e. a singularity. The Universe did not turn into a black hole - it has been a black hole the whole time.

This theory has its opponents, but many more in the scientific community support it. After all, it does fill in some gaps that have arisen over a hundred years ago.