\textit{Artistic representation of a red giant star with a strong internal magnetic fields (figure not to scale). Sound waves propagate in the stellar outer layers, while gravity waves propagate in the inner layers where a magnetic field is present. Credits: Rafael A. García (CEA), Jim Fuller (Caltech), Gabriel Pérez (SMM, IAC), Kyle C. Augustson (HAO) et NASA AIA/SDO.}
  
  