In the first second after the Big Bang, a scorching hot sea of light and particles filled the Universe. Over the last two decades, scientists have managed to recreate this liquid light and study its properties.

My latest article for BBC Science Focus attempts to answer the question, "What was the first ever 'sea' actually like?"
https://www.sciencefocus.com/space/recreated-universe-first-liquid #Science #Physics #LiquidLight