Echoes of the Universe's Creation

The video explains the early universe's evolution, starting with the formation of baryons as it cooled. It describes the emergence of sound waves, known as baryon acoustic oscillations, and how these waves influenced the universe's structure. As the universe became transparent, light could travel, and the waves froze, leading to denser regions that fostered star and galaxy formation. The expansion of the universe, driven by dark energy, is discussed, highlighting how galaxies are slightly separated by distances related to the initial wave patterns.

How did the universe become transparent, and what was the effect of this change?

What evidence do we have today that suggests galaxies are separated by a distance related to the expanding ring radius?