The Realm of the NebulaeNo modern astronomer made a more profound contribution to our understanding of the cosmos than did Edwin Hubble, who first conclusively demonstrated that the universe is expanding. Basing his theory on the observation of the change in distanct galaxies, called red shift, Hubble showed that this is a Doppler effect, or alteration in the wavelength of light, resulting from the rapid motion of celestial objects away from Earth. In 1935, Hubble described his principal observations and conclusions in the Silliman lectures at Yale University. These lectures were published the following year as "The Realm of the Nebulae," which quickly became a classic work. |
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Contents
MAGNITUDEDIFFERENCES AND LUMINOSITYRATIOS | 11 |
THE EXPLORATION OF SPACE | 20 |
FAMILY TRAITS OF NEBULĘ | 36 |
DIAMETERLUMINOSITY RELATION | 51 |
SPECTRAL TYPES AND COLORS OF NEBULĘ | 53 |
RELATIVE FREQUENCIES OF NEBULAR TYPES | 55 |
THE DISTRIBUTION OF NEBULĘ | 58 |
DISTANCES OF NEBULĘ | 83 |
THE LOCAL GROUP | 124 |
MEMBERS OF THE LOCAL GROUP | 126 |
THE GENERAL FIELD | 152 |
ABSOLUTE MAGNITUDES OF VARIOUS TYPES OF NEBULĘ | 176 |
DIAMETERS OF NEBULĘ | 178 |
SPECTROGRAPHIC MASSES OF NEBULĘ | 180 |
THE REALM OF THE NEBULĘ | 182 |
203 | |
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Common terms and phrases
absolute magnitudes actual apparent apparent magnitude approximately Astronomical average body bright brighter brightest stars Cepheids characteristics closely clouds clusters comparable complete consistent conspicuous constant corrected criteria definite density derived detail determined developed diameters difference direction discussed dispersion distances distribution effects elliptical established estimated faint fainter field follows frequent furnished galactic system given globular images included increase indicated individual interpretation irregular Journal known later less light light-years limits luminosities mass material mean measured methods million motion nebulę normal novę nucleus numbers objects obscuration observed photographic plates positive possible precise present probably problem range red-shifts reflector region relation relative represent resolved rotation sample scale scattered selected sequence significant similar solar space spectra spirals stellar system suggest surveys systematic telescopes term theory tion types uniform universe values variables various vary velocities velocity-distance relation Wilson