The Shapley-Curtis Debate – What is our Place in the Universe?

Harlow Shapley Heber Curtis

The 1920 Shapley-Curtis Debate sheds a bright light on the commonly held cosmology of the nineteenth century – a time when astronomers thought very differently about the structure and form of the Universe than we do today. Harlow Shapley and Heber Curtis were two prominent astronomers who had spent their careers studying the Milky Way galaxy.