02532cam a22003373u 4500 71654 UtSlPG 20260610134645.0 m cr n 260607r20231920utu|||||o|||||||||||||| d 20002512 UtSlPG en iso639-1 QB Hubble, Edwin, 1889-1953 Photographic investigations of faint nebulae Salt Lake City, UT : Project Gutenberg, 2023 1 online resource : multiple file formats text txt rdacontent computer c rdamedia online resource cr rdacarrier Publications of the Yerkes Observatory, volume IV part II Release date is 2023-09-15 Charlene Taylor, Bryan Ness and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) "Photographic Investigations of Faint Nebulae" by Edwin H. Hubble is a scientific publication written in the early 20th century. The work focuses on the methodical study of nebulae using photographic techniques, aiming to catalog and analyze these faint celestial objects that lie beyond our solar system. Hubble explores 512 previously uncatalogued nebulous objects organized into clusters, highlighting the significance of photographic plates in astronomy. The opening of the book presents an introduction to the study of nebulae, emphasizing the evolution of observation techniques from visual to photographic methods, demonstrating their inherent advantages. Hubble discusses the current state of knowledge regarding the nature and classification of new nebulae, noting that approximately 17,000 have been catalogued, with estimates suggesting many more await discovery. He outlines the systematic approach taken during his observations at Yerkes Observatory and mentions the classification system used for cataloging these celestial wonders while indicating the inherent challenges posed by measuring faint objects in the night sky. This sets the stage for a detailed exploration of the findings in the subsequent sections of the work. (This is an automatically generated summary.) Originally published: Chicago: The University of Chicago Press, 1920 Nebulae Publications of the Yerkes Observatory, volume IV part II https://www.gutenberg.org/ebooks/71654 112380 112380