Robert Emden
1862 - 1940
Robert Emden, (born March 4, 1862, St. Gallen, Switz.—died Oct. 8, 1940, Zürich), physicist and astrophysicist who developed a theory of expansion and compression of gas spheres and applied it to stellar structure.
The crater Emden on the Moon is named after him. The Lane-Emden equation is named for him and Jonathan Homer Lane.