 ... photography of nebulae has been continued by Hubble, Humason, and Dr. Duncan, partly for classification purposes and partly for the detailed study of interesting objects. From a comparison of two photographs of the Net Work Nebula in Cygnus taken...  The Observatory - Page 1951927Full view - About this book
 | Astronomical Society of the Pacific - 1925 - 870 pages
...the Net Work Nebula in Cygnus taken 15 years apart, Hubble finds an expansion at the rate of about 10" a century. Hubble has completed the determination...irregular nebula NGC 6822 and the spiral Messier 33 with results of 700,000 and 870,000 light-years, respectively. He also has made a statistical study of non-galactic... | |
 | 1927 - 430 pages
...interesting objects. From a comparison of two photographs of the Net Work Nebula in Cygnus taken 1 5 years apart, Hubble finds an expansion at the rate...forms ranging from globular through elliptical to closely- wound spirals, and finally to widely open spirals with arms resolved into stars. The surface... | |
 | Mount Wilson Observatory - 1917 - 616 pages
...the Net Work Nebula in Cygnus taken 15 years apart, Hubble finds an expansion at the rate of about 10" a century. Hubble has completed the determination...irregular nebula NGC 6822 and the spiral Messier 33 with results of 700,000 and 870,000 light-years, respectively. He also has made a statistical study of non-galactic... | |
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