Frank Shu

Frank Hsia-San Shu (Chinese: 徐遐生; Jyutping: Ceoi4 Haa4 Sang1; June 2, 1943 – April 22, 2023) was a Chinese-American astrophysicist, astronomer, and author. He served as a Professor Emeritus at the University of California, Berkeley and University of California, San Diego. He is best known for proposing the density wave theory to explain the structure of spiral galaxies, and for describing a model of star formation, where a giant dense molecular cloud collapses to form a star.