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The Day We Found the Universe - Marcia Bartusiak [180]

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and E. P. Hubble. 1920. “The Color of the Nebulous Stars.” Astrophysical Journal 52: 8-22.

Shapley, H. 1914. “On the Nature and Cause of Cepheid Variation.” Astrophysical Journal 40: 448-65.

——. 1915a. “Studies Based on the Colors and Magnitudes in Stellar Clusters. First Paper: The General Problem of Clusters.” Contributions from the Mount Wilson Solar Observatory, no. 115: 201-21.

——. 1915b. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Second Paper: Thirteen Hundred Stars in the Hercules Cluster (Messier 13).” Contributions from the Mount Wilson Solar Observatory 116: 225-314.

——. 1917a. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Fourth Paper: The Galactic Cluster Messier 11.” Contributions from the Mount Wilson Solar Observatory 126: 29-46.

——. 1917b. “Note on the Magnitudes of Novae in Spiral Nebulae.” Publications of the Astronomical Society of the Pacific 29: 213-17.

——. 1918a. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Sixth Paper: On the Determination of the Distances of Globular Clusters.” Astrophysical Journal 48: 89-124.

——. 1918b. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Seventh Paper: The Distances, Distribution in Space, and Dimensions of 69 Globular Clusters.” Astrophysical Journal 48: 154-81.

——. 1918c. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Eighth Paper: The Luminosities and Distances of 139 Cepheid Variables.” Astrophysical Journal 48: 279-94.

——. 1918d. “Globular Clusters and the Structure of the Galactic System.” Publications of the Astronomical Society of the Pacific 30: 42-54.

——. 1919a. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Ninth Paper: Three Notes on Cepheid Variation.” Astrophysical Journal 49: 24-41.

——. 1919b. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Tenth Paper: A Critical Magnitude in the Sequence of Stellar Luminosities.” Astrophysical Journal 49: 96-107.

——. 1919c. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Eleventh Paper: A Comparison of the Distances of Various Celestial Objects.” Astrophysical Journal 49: 249-65.

——. 1919d. “Studies Based on the Colors and Magnitudes in Stellar Clusters. Twelfth Paper: Remarks on the Arrangement of the Sidereal Universe.” Astrophysical Journal49: 311-36.

——. 1919e. “On the Existence of External Galaxies.” Publications of the Astronomical Society of the Pacific 31: 261-68.

——. 1920. “Star Clusters and the Structure of the Universe. Third Part.” Scientia 27: 93-101.

——. 1923a. “The Galactic System.” Popular Astronomy 31: 316-28.

——. 1923b. “Note on the Distance of N.G.C. 6822.” Harvard College Observatory Bulletin, no. 796 (December): 1-2.

——. 1924. “Notes on the Thermokinetics of Dolichoderine Ants.” Proceedings of the National Academy of Sciences 10 (October): 436-39.

——. 1929. “Note on the Velocities and Magnitudes of External Galaxies.” Proceedings of the National Academy of Sciences 7 (July 15): 565-70.

——. 1930a. “The Super-Galaxy Hypothesis.” Harvard College Observatory Circular, no. 350: 1-12.

——. 1930b. Flights from Chaos. New York: McGraw-Hill.

——. 1930c. Star Clusters. New York: McGraw-Hill.

——. 1969. Through Rugged Ways to the Stars. New York: Charles Scribner's Sons.

Shapley, H., and A. Ames. 1932. “A Survey of the External Galaxies Brighter Than the Thirteenth Magnitude.” Annals of the Astronomical Observatory of Harvard College 88: 41-76.

Shapley, H., and H. D. Curtis. 1921. “The Scale of the Universe.” Bulletin of the National Research Council 2 (May): 171-217.

Sheehan, W., and D. E. Osterbrock. 2000. “Hale's ‘Little Elf’: The Mental Breakdowns of George Ellery Hale.” Journal for the History of Astronomy 31: 93-114.

Shinn, C. H. c. 1890. “A Mountain Colony.” The Independent.

Singh, S. 2005. Big Bang. London: Harper Perennial.

Slipher, V. M. 1913. “The Radial Velocity of the Andromeda Nebula.” Lowell Observatory Bulletin 58, 2: 56-57.

——. 1915. “Spectrographic Observations of Nebulae.” Popular Astronomy 23: 21-24.

——. 1917a. “The

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