Extra-galactic n
Extra-galactic nebulae
作者：Hubble, Edwin, 1889-1953
体例：题 章数：40
字数：81,862 来源：Project Gutenberg
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cache/epub/68428/pg68428.txt（Project Gutenberg）
章节目录
共 40 题- EXTRA-GALACTIC NEBULAE[1]
- By EDWIN HUBBLE
- ABSTRACT
- PART I. CLASSIFICATION OF NEBULAE
- GENERAL CLASSIFICATION
- CLASSIFICATION OF NEBULAE
- REGULAR NEBULAE
- IRREGULAR NEBULAE
- PART II. STATISTICAL STUDY OF EXTRA-GALACTIC NEBULAE
- THE DATA
- RELATIVE LUMINOSITIES OF THE VARIOUS TYPES
- RELATION BETWEEN LUMINOSITIES AND DIAMETERS
- The correlations can be expressed in the form
- NOTES TO TABLES I–IV
- REDUCTION OF NEBULAE TO A STANDARD TYPE
- The correlation of the data is very closely represented by the formula
- EFFECTS OF ORIENTATION
- SIGNIFICANCE OF THE LUMINOSITY RELATION
- Since
- Let a = 1, then
- RELATION BETWEEN NUCLEAR LUMINOSITIES AND DIAMETERS
- ABSOLUTE MAGNITUDES OF EXTRA-GALACTIC NEBULAE
- LUMINOSITY OF STARS INVOLVED IN NEBULAE
- DIMENSIONS OF EXTRA-GALACTIC NEBULAE
- MASSES OF EXTRA-GALACTIC NEBULAE
- Mass = 2.6L. (9)
- MASS OF M 31
- MASS OF N.G.C. 4594
- NUMBERS OF NEBULAE TO DIFFERENT LIMITING MAGNITUDES
- DENSITY OF SPACE
- THE FINITE UNIVERSE OF GENERAL RELATIVITY
- R = 8.5×10^{28} cm = 2.7×10^{10} parsecs, (17)
- V = 1.1×10^{88} cm = 3.5×10^{32} cubic parsecs, (18)
- M = 1.8×10^{57} grams = 9×10^{22} ☉. (19)
- Transcriber’s Notes
- 1. Footnotes have been renumbered and moved to the end of the paper.
- 1. Text enclosed by underscores “_” is italicised.
- 2. Text enclosed by macrons “¯” has a line draw over it.
- 5. Text enclosed in heavy angle brackets “❰ ❱” is bold.
- 6. Text enclosed in dollar signs "$" is in TeX notation.