The world’s largest radio telescope could reveal the secrets of dark matter, the first galaxies in the universe

A feature of light absorption by the hydrogen surrounding early galaxies could be used as a 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 theorized that dark matter, a mysterious substance that makes up about 85 percent of the matter in the universe, played a huge role in the formation of the first galaxies. But since dark matter doesn’t interact with light (unlike the “normal” matter that makes up stars, planets, and us), its nature remains unknown. This means that the precise role it played when galaxies started forming remains a gap in cosmological models.

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