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Astronomers uncover new secrets of the Universe’s first five minutes

Scientists have achieved a major breakthrough in understanding the Universe’s earliest moments, measuring the amount of helium formed in the first five minutes after the Big Bang with unprecedented precision. Using one of the world’s most powerful telescopes, an international team studied 15 remarkably pristine galaxies that act as cosmic time capsules, preserving clues from nearly 13.8 billion years ago.

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