Telling Time with Stars: Using Kepler Data to Build Galactic Clocks

Casali et al. used precise Kepler asteroseismology and detailed chemical analysis to calibrate “chemical clocks” that estimate stellar ages. By studying 68 red giant stars, they identified element ratios—especially [Ce/Mg] and [Zr/Ti]—that strongly correlate with age. Applying these clocks to large star surveys reveals the Milky Way’s age structure and evolutionary history.