The ultimate fate of the universe is still a topic of active research and debate among scientists. Based on current understanding, there are a few possible scenarios for the future of the universe.
The Big Freeze or Heat Death: This is the most widely accepted theory currently, where the expansion of the universe continues to accelerate. In this scenario, galaxies move apart from each other at an increasing rate, and over an extremely long timescale, the universe becomes cold and sparse. Eventually, stars burn out, and there is no new source of energy. However, it's important to note that this scenario does not imply a specific "end" in the conventional sense but rather a state of low energy and entropy.
The Big Crunch: In this scenario, the expansion of the universe slows down and eventually reverses, leading to a contraction of the universe. This would result in a dense and hot state where all matter collapses back into a singularity. However, current observations and measurements suggest that the expansion of the universe is accelerating, making the Big Crunch less likely.
The Big Rip: This scenario suggests that the expansion of the universe continues to accelerate, eventually leading to a point where the fabric of space itself tears apart. This would result in the disintegration of all structures, including galaxies, stars, and even fundamental particles. However, the Big Rip scenario is considered less likely based on current knowledge.
Regarding vibrations or radiations reaching the "end" of the universe, it's important to understand that our current observable universe has a finite size due to the finite speed of light. We can only observe objects within a certain distance from us, known as the observable universe. The behavior of the universe beyond our observable horizon is not directly accessible to us.
As for radio waves or other forms of electromagnetic radiation, they are subject to the expansion of the universe. As the universe expands, the wavelengths of radiation also stretch, causing a redshift. This means that the further away an object is from us, the more its light is shifted towards longer wavelengths. Over extremely long timescales, this redshift can become so significant that certain wavelengths of radiation, such as radio waves, can become undetectable.
It's important to note that these scenarios and explanations are based on current scientific understanding, which is subject to revision and refinement as new data and observations become available.