A dark, space-themed header image accurately depicting matter and antimatter in a wide rectangular shape. The image shows a cosmic background with deep space and starfields. On the left, matter is represented by glowing atoms and particles in subtle hues of blue and purple. On the right, antimatter is visualized with similar particles but in contrasting tones of red and orange. In the center, there is a dramatic depiction of matter and antimatter annihilation, creating a burst of light and energy that illuminates the surrounding darkness. The overall atmosphere is mysterious and deeply scientific.

The first fraction of a second of the universe

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