Astronomy
Helioseismology: Studying the Sun's Interior Through Oscillations
Quick fact
The Sun vibrates in millions of modes, with periods ranging from 3 to 15 minutes. These oscillations were first convincingly detected in the 1960s, but their solar origin was confirmed in the 1970s.
Why this is interesting
You can't see inside the Sun, yet we know it has a hot core, a radiative zone, and a convection layer. How do we know? The Sun rings like a giant bell, and we listen.