Tag - First

Have We Finally Seen the Universe’s First Stars?

Globular clusters, such as NGC 1866, contain very old Population II stars, the generation that followed Population III. (ESA/Hubble & NASA)Long before stars illuminated the cosmos, the Universe existed in a vast sea of hydrogen and helium. Only when these gases clumped together under immense pressure did the first stars ignite, forging heavier elements in...