The Universe we live in is a transparent one, where light from stars and galaxies shines bright against a clear, dark backdrop.
But this wasn’t always the case – in its early years, the Universe was filled with a fog of hydrogen atoms that obscured light from the earliest stars and galaxies.
The intense ultraviolet light from the first generations of stars and galaxies is thought to have burned through the hydrogen fog, transforming the Universe into what we see today.
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