The world’s largest radio telescope could reveal the secrets of dark matter

This property of light being absorbed by hydrogen surrounding early galaxies could be used as a fresh new probe into the mysteries of dark matter and how it affected the evolution of the universe during the cosmic dark ages.

Scientists have long assumed that dark matter, a mysterious substance that makes up about 85% of the matter in the universe, played a large role in the formation of early galaxies. But since dark matter does not interact with light (unlike the “normal” matter that stars, planets, and us are made of), its nature remains unknown. This means that the precise role they played when galaxies began to form still represents a gap in cosmological models.

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