Extra Galactic Nebulae
Unknown
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Description
Extra-Galactic Nebulae is a research paper by Edwin Hubble, printed in the Astrophysical Journal in 1926. The journal carried it in volume sixty four, pages 321 to 369, that year. The abstract states the results of a statistical study of nebulae.
Hubble studied four hundred extra-galactic nebulae for which Holetschek had found total visual magnitudes. The list is complete for the brighter nebulae in the northern sky, the abstract says. It is representative to magnitude twelve and a half or fainter in its reach. His classification rests on the forms of the photographic images of the nebulae. About three per cent are irregular, while the rest fall into a sequence of forms with rotational symmetry. That sequence, set out here, became the famous tuning fork scheme by which galaxies are still sorted by shape.
Catalog record
| CREATOR | Unknown |
|---|---|
| COLLECTION | BOOKS |
| FORMAT | TXT |
| FILE SIZE | 111 KB |
| VERSION | 1.0 |
| LICENSE | Public Domain |
| RIGHTS | PUBLIC DOMAIN |
| SOURCE | Project Gutenberg |