Download Deep-Sky Companions: The Messier Objects by O'Meara S.J. PDF
By O'Meara S.J.
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Additional resources for Deep-Sky Companions: The Messier Objects
Flammarion, Camille. Bulletin de la Societe Astronomique de France (1929). Gingerich, Owen. “Messier and His Catalogue,” in John H. Mallas and Evered Kreimer, The Messier Album. Cambridge, MA: Sky Publishing Corporation, 1978. Glyn Jones, Kenneth. The Search for the Nebulae. Chalfont St. Giles: Alpha Academic, 1975. Glyn Jones, Kenneth. Messier’s Nebulae and Star Clusters, 2nd ed. Cambridge: Cambridge University Press, 1991. Graun, Ken. The Next Step: Finding and Viewing Messier’s Objects. Tucson, AZ: Ken Press, 2005.
Stars and interstellar matter; the diameter of the halo is about 130,000 light-years. Finally, there is the galactic corona, extending some 200,000 to 300,000 light-years. Researchers believe that the mysterious dark matter (material that escapes visual detection; its presence is inferred from gravitational effects) inhabits this region. The Milky Way Galaxy is our home in the universe. The universe is replete with billions of galaxies, each of which is home to billions of hundreds of billions of stars.
This dark-sky myth is deeply rooted. ) Limiting magnitude is itself a very good indicator of a sky’s quality. But another myth can blind us from determining that limit accurately. 5 magnitude fainter.