Titre du document

Morphological Features of Individual Galaxies

Lien vers le document
Nom du Corpus

AstroConcepts

Auteur(s)
  • F. Zwicky
Affiliation(s)
  • Astrophysics california Institute of Technology and Astronomer, Mount Wilson and Palomar Observatories, USA
Résumé

Galaxies, or extragalactic nebulae, as we now know are more or less vast systems of stars. The galactic nebulae on the other hand are masses of gas illuminated by hot stars whose radiations excite the gases to fluorescent emission. The great nebula in Andromeda which is an extragalactic stellar system visible to the naked eye was already known to the Arabs. With the advent of the telescope it was soon recognized that there exist very many similar nebulae. For centuries, however, with the telescopes then available one could not distinguish between the galactic and the extragalactic nebulae. The story of how astronomers finally learned to recognize the true characters of these objects is a long and confused one. It is beyond the scope of this book to go into any details but, if some of the great names are to be mentioned, the Herschels perhaps come first because of their extensive surveys of the skies and their suggesting the idea of island universes. Lord Rosse discovered that some of the nebulae have spiral structure and the pholosopher Kant must be mentioned because of his remarkable speculations and his arguments supporting these speculations that the numerous nebulae in high galactic latitudes are extragalactic stellar systems.

Langue(s) du document
Anglais
Année de publication
1957
Revue

Morphological Astronomy

Éditeur
Springer (e-books)
Type de publication
book
Type de document
chapter
Présence de XML structuré
Non
Version de PDF
1.4
Score de qualité du texte
9.46
Nom du concept
  • Gravitational lenses
Identifiant ISTEX
4D32D095AB1320459A37DED67FE55430EB8CF683
ark:/67375/HCB-TJL0DNLK-0
Powered by Lodex 9.4.5