Results 81 to 90 of about 61,724 (212)
, 2021 Notre vision des galaxies a beaucoup changé depuis l’ère des grands relevés de galaxies, tels que le Sloan, qui nous apportent une grande statistique avec des millions de galaxies. La classification de la séquence de Hubble est toujours très utilisée, mais elle s’est enrichie de grandes catégories basées sur les couleurs, qui tracent la formation ...
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SECULAR EVOLUTION OF SPIRAL GALAXIES [PDF]
Journal of The Korean Astronomical Society, 2003 15 pages, 8 figures, Invited talk presented at the 2nd APCTP workshop on Astrophysics, Pohang, Korea (June 2002)
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ChemPhotoChem, Volume 10, Issue 4, April 2026.This review connects chiroptical spectroscopy, asymmetric catalysis, and spintronics, revealing how chirality influences the interactions of matter with light, charge, and spin. Across diverse systems, remarkable chiroptical effects emerge, showing among others that high efficiencies can arise without absolute enantiopurity, and that functionality is ...
Charitini Panagiotopoulou +5 more
wiley +1 more source
Nonlinear Density Wave Theory in a Gaseous Disk
The Astronomical Journal, 2023 A nonlinear solution for the gaseous component of a galactic disk has been derived self-consistently using fluid description and reductive perturbation theory. We show that gas follows a spiral pattern, similarly to the stellar component; but the spirals
Miroslava Vukcevic
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Spiral structure in external galaxies [PDF]
Symposium - International Astronomical Union, 1970 The need for observing at least four different categories of optical objects for a satisfactory definition of optical spiral structure is emphasized. A sequence of optical form-types for the description of spiral structure is outlined. A pronounced difference in the nature of the spiral structure of the outer and inner parts of Messier 33 is ...
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Fortschritte der Physik, Volume 74, Issue 4, April 2026.Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
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A Comprehensive Analysis on the Nature of the Spiral Arms in NGC 3686, NGC 4321, and NGC 2403
GalaxiesIn theoretical investigations, various mechanisms have been put forward to explain the emergence of spiral patterns in galaxies. One of the few ways to find out the nature of spirals in a particular galaxy is to consider the so-called corotation radius ...
Valeria Kostiuk +3 more
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Space Weather, Volume 24, Issue 4, April 2026.Abstract The South Atlantic Anomaly (SAA) in Earth's radiation belt is a critical region that poses significant threats to the safety of Space Stations. This region harbors a high concentration of energetic particles that can penetrate Space Stations, thereby affecting onboard components and posing risks to astronauts.
Xiang Dong +5 more
wiley +1 more source
Discrete Dynamics in Nature and Society, 1999 Three kinds of results have been described in this paper. Firstly, an experimental study of the Rossby vortex meridional drift on the rotating shallow water has been carried out.
M. V. Nezlin +4 more
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The future of galaxies and the fate of intelligent life [PDF]
Serbian Astronomical Journal, 1999 We investigate the influence of recent advances in research on the gaseous content of the universe on our knowledge of star formation histories of spiral galaxies.
Ćirković M.M.
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