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Nebulae
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1926 Johan LE Dreyer, Danish astronomer (Catalog of Nebulae), dies at 74
1920 H Shapley and H D Curtis hold "great debate" on nature of nebulae 1871 John F. W. Herschel, British astronomer (Catalogue of Nebulae), dies 1864 William Huggins discovers chemical composition of nebulae 1852 Johan L. E. Dreyer, Danish astronomer, New general catalogue of nebulae 1824 William Higgins, discoverer, nature of spiral nebulae |
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