Physics
Asteroseismology: Probing Stellar Interiors and Ages
Quick fact
Asteroseismology allows astronomers to measure a star's internal rotation, composition gradients, and age to within a few percent, something no other technique can achieve for distant stars.
Why this is interesting
When you look at a star, it seems calm and unchanging. But inside, every star is vibrating like a giant bell—how can listening to those vibrations reveal the star's age?