It began its life when a group of particularly massive stars, producing strong stellar winds, created individual expanding bubbles of hot gas. (sciencedaily.com)
During their lives, massive stars produce copious amounts of ionising radiation and kinetic energy through strong stellar winds. (sciencedaily.com)
When Population III stars matured into supergiant stars after a few million years of life or so, however, they blew off heavier elements in strong stellar winds, and many probably exploded as supernovae, contaminating the universe with richer gas and dust. (members.nova.org)