1. What we observe has already happened
The big bang and black holes, two interesting locations in the universe, are where the General Theory of Relativity, our most sophisticated current theory of gravity, breaks down. One is located where time is thought to have begun, while the other is where time is thought to come to an end. Einstein's goal of developing a broad, unifying theory that combined the four forces of the universe—gravity, electromagnetic, strong, and weak nuclear forces—was abandoned during the latter quarter of his life. Since humans are the most intelligent species and have so far never detected any evidence of extraterrestrial life, realising this desire will be one of humanity's greatest successes in history. Nevertheless, the String Theory is one contender in this. The black hole and the big bang are both explored by string theory.
According to Schrodinger's equation, the universe is not deterministic but can instead be explained by a wave function. According to the Hamiltonian, all visible and quantifiable states of particles exist as waves, with the chance of each state existing being equal to one. Heisenberg's Uncertainty Principle also forbids the simultaneous determination of any two quantities at the same particle state. This demonstrates how strange it is that the universe is regulated by laws that it has produced. It certainly paints a vivid picture of the cosmos' music. We can read the thoughts of God if we can decipher those rules. The most astounding gravitational wave finding ever made by LIGO (Laser Interferometer Gravitational Observatory) in 2015 showed that the roughly 13 billion light-years-away gravitational waves Einstein predicted more than a century earlier originated from the merger of two black holes. Is it true that we are receiving all cosmic observations from the past if it took the light about 13 billion years to reach us? Of course it functions in that way.
Using the earth as the central point of reference, 13.4 billion light years separate us from the universe's farthest edge. In other words, it has taken 13.4 billion light years for the light from the universe's farthest galaxies to reach us. However, the expansion of the cosmos is considerably faster. Therefore, it should be inferred that the galaxy whose light we have discovered may have already vanished beyond our range during the time it took for the light to reach us. After 13.4 billion years, when the light finally reaches us, we shall know what is happening right now at the edge of the universe.As a result, by the time a cosmic event becomes known to us, we perceive it to have happened in the past. That is an odd question, but one that deserves consideration. This oddity emerges due to the fact that the speed limit of the Universe(the speed one can travel through vacuum) is vast but finite “c.”
2. The implications of the universe's expansion
The Universe as we currently understand is expanding rapidly. Because light cannot reach them in the same way that it can at us, the cosmic even that we observe will not be perceived by our younger ones as it will have left the sphere of human grasp. Even when applied to our generation, it is possible to conclude that we are unable to obtain a complete knowledge of the universe because the significant event that may have provided evidence for additional truth-revealing may have already vanished from our vicinity.The Big Bang's remains, the CMB (Cosmic Microwave Background), have been getting colder and longer, finally dipping into the microwave spectrum. One day, the cosmos will be completely dark and devoid of any distant galaxies. Our younger generation won't understand the concept of an ever-expanding, enormous cosmos, and they won't accept the reality of the rules that the universe is actually subject to. Consequently, based on their insight, their model of the cosmos will be straightforward and static.
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