
One of the most profound and challenging topics in cosmology is the distinction between the observable universe vs actual universe. While our simulations can help us understand what we can see, they also highlight the limitations of our perspective. The scale of the observable universe is immense, spanning about 93 billion light-years in diameter. However, the "actual" universe is thought to be far larger, perhaps infinite, and its true extent remains a major cosmic mystery.
The question of how the observable universe was discovered is fascinating. It wasn't a single event but a cumulative process of astronomical observation and theoretical work. Through powerful telescopes and meticulous data analysis, astronomers have mapped the distribution of galaxies and the cosmic microwave background radiation. These observations allowed scientists to calculate the maximum distance from which light has had time to reach us since the Big Bang, defining the boundary of our observable cosmic neighborhood. This process is how we continue to refine our understanding of the cosmos's vast scale.
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