Who Made The HR Diagram?
Who Made The HR Diagram? Of great importance to theories of stellar evolution, it evolved from charts begun in 1911 by the Danish astronomer Ejnar Hertzsprung and independently by the U.S. astronomer Henry Norris Russell. What is the H-R diagram based on? Developed independently in the early 1900s by Ejnar Hertzsprung and Henry Norris Russell,