Cecilia Payne-Gaposchkin - born May 10, 1900 in Wendover, England

How does the composition of a star affect the temperature? In 1925 a young woman solved this puzzle in her doctoral thesis. Her analysis was a great breakthrough in astrophysics. Otto Struve described it as "the most brilliant Ph.D. thesis ever written in astronomy."

Cecilia Payne-Gaposchkin

Mona Evans