A 3D simulation depicting the Lyman-alpha forest at a redshift of 3. This visualization shows a 30 million light-year cube filled with a complex network of hydrogen gas clouds that absorb light from distant quasars. The denser regions are shown in brighter colors. This represents a possible distribution of these clouds in the early universe. The image reveals the intricate structure and density of these ancient gas clouds, offering insights into the early universe's composition and evolution.

Astronomy Picture from 12/11/2000

The Lyman Alpha Forest

Source: https://apod.nasa.gov/apod/ap001112.html


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