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Having returned to Montreal in 1920, she continued her studies, earning a bachelor's degree and then a master's degree in 1921. She went on to the University of Cambridge, studying under Arthur Eddington, one of the leading astronomers of the day. She earned her PhD in astrophysics through McGill in 1926 and was the first person to receive it from a Quebec university, and one of the first women to accomplish this in North America. Douglas wrote an important biography of Eddington, "The Life of Arthur Eddington".