If a region of the universe during the big bang is the pink/black colors and a region of the universe today shows the sky-blue galaxies and stars, what are the yellow squiggly lines and when did they occur

Question

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The yellow squiggly lines represent the Cosmic Microwave Background (CMB) radiation, which is the leftover thermal radiation from the Big Bang. It occurred about 380,000 years after the Big Bang, during the era called the recombination epoch, when protons and electrons combined to form neutral atoms and photons were able to travel freely for the first time. The CMB is an important piece of evidence for the Big Bang theory and helps us understand the early universe.

If a Region of the Universe During the Big Bang