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In the 19th century, the exact nature of galaxies was not yet understood, and the early catalogs simply grouped together open clusters, globular clusters, nebulas, and galaxies: the Messier catalog has 110 in total. The Andromeda Galaxy is Messier object 31, or M31; the Whirlpool Galaxy is M51.
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The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
1920 – In the Great Debate between Harlow Shapley and Heber Curtis, galaxies are finally recognized as objects beyond the Milky Way, and the Milky Way as a galaxy proper. [166] Within it lies the Solar System. 1930 – Clyde Tombaugh discovers Pluto. [167] It was regarded for decades as the ninth planet of the Solar System.
Galaxies discovered in the 19th century ... Galaxies discovered in the 21st century (6 C, 1 P) This page was last edited on 16 January 2024, at 18:09 (UTC). ...
Galaxies discovered in the 19th century (16 C) This page was last edited on 2 January 2022, at 08:28 (UTC). Text is available under the Creative Commons Attribution ...
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The name of this galaxy is based on a Redshift (z) ... 20th century [d] 11.8 Mly z=-0.10) This is the lower bound, as it is remotest galaxy observable with the naked ...