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The cosmological horizon is the limit beyond which we cannot observe the universe in principle. Read more later.
First, the universe is expanding at an accelerating rate. This fact is well established and generally does not cause doubts in the scientific community.
Secondly, nothing can move faster than the speed of light in a vacuum. Including the light itself.
Combining these two theses, we get that the further away from Earth we look through a telescope, the faster these regions of the universe move away from us due to cosmological expansion. And for very distant objects, the speed of their removal from us becomes equal to the speed of light, and then begins to exceed it. Consequently, any signal from such objects (for example, light from stars) will never be able to reach the Earth – the universe is expanding faster. The distance to such objects is called the cosmological horizon. Anything closer to the horizon, we can observe. We can't do what happens next, and we never will.
And since the universe is expanding at an accelerated rate, the cosmological horizon is gradually decreasing. That is, over time, we will observe fewer and fewer stellar objects, because they will hide from us behind the cosmological horizon-they will start moving away from us faster than the speed of light.
And immediately I hasten to dispel a typical misunderstanding. The speed of cosmological expansion of the universe can exceed the speed of light. Because no material objects are moved at the same time. There is no contradiction with thesis number two here.
You know that there is something beyond the horizon but you don't know that many things and events happen by themselves And nothing just has to happen and be