HD 112485 is a massive pulsating star in an eclipsing binary, a system where the stars periodically pass in front of one another as seen from Earth. Its internal rotation may vary with depth: the analysis tentatively points to different rotation rates inside the star. The result comes from comparing the star’s pulsations with models of its interior and evolution. The work examined TESS observations of 65 β Cephei stars in eclipsing binaries. These are massive stars that expand and contract...