The limits of the universe:
The universe is expanding with continuous acceleration, which means that the speed of the universe's acceleration at some point exceeds the speed of light. From our perspective, this point appears to be the edge of the universe, as no information can reach us from that point.
To simplify this idea, imagine that you are driving a car and the top speed for this car is 100 km per hour. Suppose it is your responsibility to transfer information between points (x) and (z).
Now imagine that the road is a treadmill (a moving carpet) in reverse and imagine that the speed of this carpet is moving about 50 km in the opposite direction, this means that your car will travel the distance twice as long, but it will arrive in the end. Now imagine that the moving carpet is moving at a speed of 150 km per hour, this means that your car will not reach its target regardless of its speed, and in fact it will move away from the arrival point with time.
Any information present in a cosmic space-time acceleration faster than the speed of light is a piece of information that will never reach us and it seems as if it does not exist.
No piece of information can travel between two spacetime points at a speed faster than the speed of causation (the speed of light). Now imagine with me the point of acceleration of the universe that exceeds the speed of causation. This point forms an information barrier between what is in the section of the universe that is expanding slower than light and the section that is accelerating faster than the speed of light. These two parts of the universe cannot communicate.
Now it is wrong to assume that the velocity of acceleration close to the speed of light is the farthest point from our current location, because this assumption is based on the premise that we are in the center of the universe, and this assumption is wrong.
Here's what I visualize about this idea:
Every point in the universe is accelerating incrementally, and the acceleration relationship is related to the entropy at that point, meaning that time is the only factor by which we can assume the acceleration of the universe is increasing. Time = acceleration and therefore the more time passes, the greater the speed of expansion and the rate of acceleration also increased until we reach a point of acceleration exceeding the speed of light, so the two parts become outside the scope of communication.
These are the limitations of the cosmic bubble in which we live, but it is not the universe.
In another saying, everything in the universe resides within a bubble of space whose diameter is the space needed for the acceleration of its expansion to reach the speed of light.
But assuming we somehow managed to travel at a thousand times the speed of light and tried to reach the edge of the bubble (the point where the velocity of expansion separates between faster and slower than the speed of light). We will discover that the diameter of the bubble travels with us in any direction we move in.
Why can't we reach the edge of the bubble?
The cosmic bubble (the visible universe) is the necessary distance from the spatial tissue for the acceleration to reach the speed of light, and therefore wherever we are in the universe we will observe a visible universe with the same area required for the acceleration to reach the speed of light and then an information barrier appears (an acceleration point exceeding the speed of light) or what is called the edge of the universe .
What does this visualization mean:
There are several points that can be assumed based on this scenario:
Our universe could be many times larger than what we assume today.
The age of the bubble in which we live is what we call the age of the hypothetical universe, and therefore we do not know the true age of the universe.