What was Annie's defining professional contribution?
Cataloging and classifying stars
Discovering the theory of relativity
Inventing the telescope
Developing the atomic model
Answer
Annie Cannon made her defining professional contribution by cataloging and classifying stars. She was a part of the Henry Draper Memorial project, which was tasked with compiling a catalog of the stars in the Milky Way galaxy. Cannon was responsible for classifying the stars by their spectral type, which is a measure of their temperature.
Shooting for the Stars: The Remarkable Journey of Annie Jump Cannon
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