The reason why we cannot see beyond a certain point in the universe is primarily due to the limitations imposed by the speed of light and the expansion of the universe.
1. Speed of light: The speed of light in a vacuum is approximately 299,792 kilometers per second (186,282 miles per second). Light travels at this finite speed, and it takes time for light to travel from distant objects to reach us. For example, it takes about 8 minutes for light from the Sun to reach Earth. The farther away an object is, the longer it takes for its light to reach us. This means that when we observe distant objects in the universe, we are seeing them as they appeared in the past, not as they are at the present moment.
2. Expansion of the universe: The universe is constantly expanding, meaning that the space between distant objects is increasing over time. This expansion affects the light coming from those objects. As the light travels through expanding space, its wavelength is stretched, causing a phenomenon called cosmological redshift. This redshift shifts the light towards longer wavelengths, shifting it more towards the red end of the electromagnetic spectrum. The amount of redshift depends on the distance between us and the object and the expansion rate of the universe.

As a result of these factors, there is a limit to how far we can see into the universe, known as the observable universe. The observable universe is the portion of the universe that is accessible to us based on the age of the universe (approximately 13.8 billion years) and the speed at which light travels. The current estimate for the size of the observable universe is about 93 billion light-years in diameter.

Beyond the observable universe, there may be regions that we cannot currently observe or detect because the light from those regions has not had enough time to reach us or has been redshifted to such an extent that it falls outside the detectable range of our instruments. These regions are often referred to as the "unobservable universe."
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