Astronomers have discovered a surprisingly "pristine" red giant with the lowest concentration of heavy elements ever seen in a star, likely a direct descendant of one of the universe's first stars.
Located near the edge of the Milky Way, this unusual star breaks a major rule of star formation due to its extremely low metal content.
It is so metal-poor that it challenges our understanding of star formation.
All known stars are powered by nuclear fusion, where atoms of lighter elements are fused into heavier elements under immense pressure, emitting large amounts of energy in the process.
Author's summary: Astronomers discover a pristine red giant star near the Milky Way's edge.