Age vs stellar size
Theory states that very large Pop III stars burn through their hydrogen/helium fuel very quickly generating the metallic elements. And then they go nova or supernova, distributing these components to seed newer generation stars.
The existance of this galaxy may provide evidence for a new stellar evolution route. Where smaller, old stars hang around for billions of years. Not burning through their fuel quickly and, as a result, not producing great quantities of heavy elements.
Biting the hand that feeds IT
