Extraterrestrial beings or Aliens
Enrico Fermi, the renowned Italian physicist, is widely recognized as one of the greatest physicists in history. He played a pivotal role in establishing the fundamental principles of modern physics during the 20th century. Interestingly, despite his significant contributions, Fermi dedicated relatively little time to pondering the Fermi Paradox. In fact, it was merely a passing comment for him. The central question posed by this paradox is: "Where are they?" Here, "they" refers to extraterrestrial beings or aliens. Considering the vast expanse of our galaxy, known as the Milky Way, and the immense scale of the universe, it becomes evident that we inhabit a vast cosmic realm. The Milky Way alone boasts approximately 400 billion suns, with a substantial number of them hosting planetary systems. Consequently, there exists an abundance of habitable space, and more than enough time for civilizations to evolve and flourish. However, the crux of the Fermi Paradox lies in the fact that despite billions of years and countless worlds, we have yet to encounter any concrete evidence of extraterrestrial life within our galaxy. Thus, the paradox persists: Why is this the case?