University of Arizona astronomers have learned more about a surprisingly mature galaxy that existed when the universe was just less than 300 million years old—just 2% of its current age.

Minerals swept up on land by this “glacial broom” altered marine chemistry and infused oceans with nutrients that they say may have shaped how complex life evolved. This ancient period of deep ...

Minerals swept up on land by this “glacial broom” altered marine chemistry and infused oceans with nutrients that they say may have shaped how complex life evolved. This ancient period of deep ...