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Summary

The concept of the universe has captivated human curiosity for centuries, but what lies at its edge? The truth is that the edge of the universe is not defined by a physical boundary but by the limits of what we can observe and understand. Space stretches endlessly in every direction, but as we look farther and farther, the light from distant objects becomes increasingly redshifted, eventually disappearing beyond our ability to detect it. This phenomenon marks the boundary of the observable universe, a region from which light has had enough time to reach us since the beginning of the universe, around 13.8 billion years ago. 
At the edge of the observable universe, we find a vast expanse of empty space, known as the "cosmic void." These regions contain few galaxies, stars, or other celestial objects, and their emptiness gives them an eerie and mysterious quality. The voids between galaxies are immense, sometimes stretching hundreds of millions of light-years across, and they represent one of the most puzzling aspects of cosmology. Why are these vast expanses of nothingness so prevalent? And what does it mean for the structure of the universe? 
As we peer deeper into space, we encounter objects that have been traveling towards us for billions of years, their light providing a glimpse into the past. The most distant galaxies, discovered using advanced telescopes, show us the early universe as it was just a few hundred million years after the Big Bang. These galaxies offer valuable clues about the formation of stars, galaxies, and larger cosmic structures. However, the farther we look, the more difficult it becomes to see clearly. The expansion of the universe means that galaxies are moving away from us at an accelerating rate, causing their light to become increasingly stretched out, or redshifted. This makes them harder to detect and study, and the universe seems to grow darker the farther we look.

Duration: about 2 hours (01:40:09)
Publishing date: 2025-04-04; Unabridged; Copyright Year: — Copyright Statment: —

• Science & Technology