The concept of the beginning of the universe and its current state of infinity can be challenging to comprehend, and our understanding of these complex topics continues to evolve. However, I'll do my best to explain the current scientific understanding
The widely accepted scientific model for the origin and evolution of the universe is the Big Bang theory. According to this theory, the universe originated approximately 13.8 billion years ago from an extremely hot and dense state known as a singularity. At the moment of the Big Bang, the universe underwent a rapid expansion known as cosmic inflation, leading to the formation of matter, energy, and the subsequent development of galaxies, stars, and other cosmic structures.
Regarding the concept of infinity, it's important to differentiate between the observable universe and the entire universe. The observable universe refers to the portion of the universe that we can potentially observe from Earth given the limitations of the speed of light and the age of the universe. It is estimated to have a radius of about 46 billion light-years, encompassing the light that has had enough time to reach us since the Big Bang.
However, the observable universe does not represent the entirety of the universe. The universe may extend beyond the observable boundaries, and its overall size and shape are still subjects of investigation and debate among cosmologists. The current prevailing view is that the universe is either infinite in size or significantly larger than the observable universe. In an infinite universe, there would be no specific boundary or edge.
As for the question of how the universe went from non-existence to its current state within a finite period of time, it's crucial to note that the concept of "before" the Big Bang is not well-defined within our current understanding of physics. The singularity from which the universe originated represents a point beyond which our current laws of physics break down, and our understanding is limited.
To better address questions about the origin of the universe, scientists are actively exploring various cosmological models, such as quantum cosmology and string theory, which aim to provide a more comprehensive understanding of the early universe and the nature of space and time.
It's important to remember that our understanding of the universe's origins and its current state is still an active area of research and subject to refinement. New observations, experimental data, and theoretical advancements will likely continue to shape our understanding of these profound questions about the nature of our universe.