1901 ⟶ Publication of the Henry Draper Catalogue and Stellar Classification
A comprehensive survey of stars, the Henry Draper Catalogue,...
Year
1872
1901
1920
⭐ First Photograph of a Star's Spectrum Reveals Chemical Composition
An American astronomer Henry Draper takes the first photograph of the spectrum of a star (Vega), showing absorption lines that reveal its chemical makeup. Astronomers begin to see that spectroscopy is the key to understanding how stars evolve. William Huggins uses absorption lines to measure the redshifts of stars, which give the first indication of how fast stars are moving.⟶
SpectroscopyAstronomyStellar CompositionRedshiftWilliam HugginsHenry DraperAstrophysics19th Century Science
United States
United Kingdom⭐ Publication of the Henry Draper Catalogue and Stellar Classification
A comprehensive survey of stars, the Henry Draper Catalogue, is published. In the catalog, Annie Jump Cannon proposes a sequence of classifying stars by the absorption lines in their spectra, which is still in use today.⟶
AstronomyStellar ClassificationHenry Draper CatalogueAnnie Jump CannonSpectroscopyStars20th Century
United States🌟 Eddington proposes stellar nucleosynthesis
Stellar NucleosynthesisAstrophysicsEddingtonNuclear PhysicsCosmologyStars20th Century
United Kingdom