c. 1900: Barnard decides ìdarkî clouds are obscuring material, not ìholesî in the distribution of stars
c. 1920s-30s: work of Annie Jump Cannon, Henry Norris Russell, and legions of others lead to decoding stellar structure and evolution from spectra of stars
1947 Bok & Reilly suggest smallest Barnard objects (now called ìBok Globulesî) may be protostars
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