Abstract:
Observational cosmology of the first decades of the Twentieth Century was dominated by two giants: Edwin Hubble and Harlow Shapley. Hubble's major contributions were to the study and classification of individual galaxies with large telescopes, whereas Shapley is best remembered for his work on groups and clusters of galaxies using telescopes of more modest aperture.
HUBBLE AND SHAPLEY - TWO EARLY GIANTS OF OBSERVATIONAL COSMOLOGY by Sidney van den Bergh
COSMIC JOURNEY: A HISTORY OF SCIENTIFIC COSMOLOGY
Astronomers and public perception
Shapley and Curtis documents on the universe--1921
"The Day We Found the Universe"--H. Shapley & the Milky Way
"The Great Debate" [1921]--Shapley & Curtis
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