Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog Project Gutenberg 2022-06-30 Public domain in the USA. 185 Hubble, Edwin 1889 1953 Hubble, Edwin Powell Extra-galactic nebulae $aUnited States :$bThe University of Chicago Press,$c1926. Anonymous (This book was produced from images made available by the HathiTrust Digital Library.) "Extra-galactic Nebulae" by Edwin Hubble is a scientific publication written in the early 20th century. This work primarily focuses on the detailed classification and statistical investigation of extra-galactic nebulae, which are celestial formations distinct from those within our Milky Way galaxy. Hubble delves into the characteristics and distribution of these nebulae, making pivotal observations that contributed to our understanding of the cosmos. The opening of "Extra-galactic Nebulae" presents an abstract and introduction to the study, emphasizing a statistical analysis of 400 extra-galactic nebulae, observed and classified according to their visual magnitudes and structural forms. The classification reveals that approximately 97% of the nebulae exhibit regular forms, reflecting rotational symmetry around dominating nuclei, while a small fraction appears irregular in structure. Hubble discusses the relationships between luminosity, apparent size, and distance, providing a foundation for the subsequent detailed classification of different types of nebulae, which includes elliptical, spiral, and irregular categories, suggesting that these classifications may correspond to different evolutionary phases of astronomical bodies. (This is an automatically generated summary.) https://hdl.handle.net/2027/uc1.b3805680 20220624172413hubble 1926 US Reading ease score: 68.5 (8th & 9th grade). Neither easy nor difficult to read. en Milky Way Nebulae QB Text Category: Science - Physics 224973 2025-06-27T06:59:41.206244 text/html 230412 2022-06-29T23:09:20 text/html 1850123 2025-06-27T07:00:05.568156 application/epub+zip 1851149 2025-06-27T06:59:51.066183 application/epub+zip 261418 2025-06-27T06:59:42.164240 application/epub+zip 2997610 2025-06-27T07:00:10.483271 application/x-mobipocket-ebook 2946124 2025-06-27T06:59:56.843191 application/x-mobipocket-ebook 1025603 2022-09-30T19:47:46.862693 application/x-mobipocket-ebook 137455 2025-06-27T06:59:39.964253 text/plain; charset=us-ascii 137140 2022-06-29T23:09:20 text/plain; charset=us-ascii 16725 2025-06-27T07:00:10.636079 application/rdf+xml 17413 2025-06-27T06:59:42.463226 image/jpeg 2473 2025-06-27T06:59:42.312216 image/jpeg 42970 2022-06-29T23:11:56 application/octet-stream application/zip 2212568 2022-06-29T23:11:58 application/octet-stream application/zip 2225457 2025-06-27T06:59:41.334276 application/octet-stream application/zip en.wikipedia