Unveiling Cosmic Dawn: the synergetic role of space and ground-based telescopes

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  • Author: Jean-Gabriel Cuby
According to our current model, the Universe started as a singularity and then rapidly expanded, filled with hot plasma, dark matter and energy in equilibrium. About 400,000 years later (corresponding to a redshift z~1100; see Figure 1) the mean density of the expanding Universe became low enough that light (electromagnetic radiation) and matter decoupled and matter condensed into a neutral state. Light we see from this epoch forms the cosmic microwave background (CMB), which carries the imprint of the matter density fluctuations that existed at that time.
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