The concept of existence when assumed to be eternal, and therefore, there can't be a starting point for existence, nor an end to the universe.

However, it's crucial to consider what existence truly means, social or philosophical understanding doesn't align with how existence is interpreted in the realm of physical science.

Let's explore physical existence in terms of the Planck scale, specifically the Planck length. This scale marks the point where classical notions of gravity and space-time no longer apply, and quantum effects take over. Even before reaching the Planck length, our physical perception becomes ineffective, and we can never fully grasp anything beyond this threshold. The Planck length, approximately 1.616255×10^−35 meters, is defined by physical constants such as the speed of light, the Planck constant, and the gravitational constant. It serves as the limit of physical reality perception.

So, physical reality's inception occurs well before we reach the Planck length, and its end is when it reaches the Planck length. Our physical universe and existence are confined within this Planck threshold. We can't observe or measure anything beyond it, even with advanced technology in the distant future. The Planck length stands as our permanent perceptual limit.

While we may experience gravitational or antigravitational effects from existence beyond our physical perception, such existence holds no meaning within our physical domain because we can't perceive events and time from this imperceptible existence beyond our physical reality.

The notion of a beginning and an end is rooted in our limited perception. The Big Bang and Black Holes, for instance, hypothesize domains beyond our perceptual capabilities. The concept of a beginning and end of physical existence is mathematically possible beyond our perceptible reality.

Therefore, one cannot dismiss the idea of a beginning and an end to existence considering our physical limitations. Furthermore, eternal existence doesn't account for the effects of dark energy and the gravitational influences of black holes, which we can perceive as interactions from the non-existent reality.

It's important to note that the Planck length represents a fundamental limit to our current understanding of physical reality. However, claiming that our physical universe's existence begins and ends strictly at the Planck length might be an oversimplification. While it serves as a lower limit for our perception, it doesn't necessarily define the boundaries of the universe itself.

Furthermore, acknowledging the existence of phenomena beyond our perception, such as dark energy and the gravitational effects of black holes, is essential. These interactions may provide insights into regions of the universe that we can't directly observe.

So it is essential to recognize that scientific understanding of existence and the universe is a complex field that extends far beyond our current comprehension. While the Planck length is a crucial concept, defining the precise boundaries of the universe based solely on it remains a topic of ongoing research and debate. Additionally, accounting for phenomena like dark energy and black holes is crucial in our quest to comprehend the universe fully.

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