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The Andromeda Galaxy ... M31 is a large spiral galaxy, ... Photographic plates are hardly used in astronomy any more, due to their very low efficiency (a few percent at best) compared to electronic detectors such as charge-coupled devices (CCDs) which can collect more than 50% of the light falling on them.
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www.noao.edu/image_gallery/html/im0424.html
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The brightest globular cluster of the Andromeda Galaxy M31, G1, is also the most luminous globular in the Local Group of Galaxies; ... Despite the large amount of knowledge we now have about the Andromeda Galaxy, its distance, though among the best known intergalactic distances, is not really well-known.
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www.seds.org/Messier/m/m031.html
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On September 2, 2009, a team of astronomers (using the Canada-France Hawaii Telescope for the Pan-Andromeda Archaeological Survey or PAndAS) announced the discovery of stars and coherent structures that are almost certainly remnants of dwarf galaxies destroyed by the tidal field of Andromeda (M31). ... A Large Spiral Galaxy...
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www.solstation.com/x-objects/andromeda.htm
www.solstation.com/x-objects/andromeda.htm
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That will let us study M31's star-formation processes in much greater detail than previously possible."; M31, also known as the Andromeda Galaxy, is more than 220,000 light-years across and lies 2.5 million light-years away.
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www.nasa.gov/mission_pages/swift/bursts/uv_andromeda.ht...
www.nasa.gov/mission_pages/swift/bursts/uv_andromeda.html
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The first thing to notice is that the Andromeda Galaxy, ... Young and massive stars tend to be blue and the color image vividly shows that such stars are preferentially born within the arms of a spiral galaxy. The condensations of dust within M31 are typically mixed with molecular gas (which is best seen at radio wavelengths;
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coolcosmos.ipac.caltech.edu/cosmic_classroom/multiwavel...
coolcosmos.ipac.caltech.edu/cosmic_classroom/multiwavelength_astronomy/multiwavelength_museum/m31.html
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In the year 964 a Persian astronomer by the name of Al-Sufi described and depicted M 31, the Andromeda Galaxy, in his "Book of Fixed Stars". He describes it as "a little cloud" lying before the mouth of a Big Fish, an Arabic constellation. ... What to expect when observing M31?
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www.backyard-astro.com/focusonarchive/m31/m31.html
www.backyard-astro.com/focusonarchive/m31/m31.html
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The active nucleus of a spiral galaxy; ... The regions are obscured the least in the plane of the galaxy, and are strongest when we look out into the galactic halo, at right angles to this plane; ... The Andromeda galaxy (M31) is best described as;
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www.commnet.edu/tx_acad/Examinations/Astronomy/Astronom...
www.commnet.edu/tx_acad/Examinations/Astronomy/Astronomy%20Final%20Fall%202000.htm
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Spiral Galaxy M-31 (NGC 224) "The Andromeda Galaxy" ... NGC 206: A star cloud in the SW part of M-31.... it is extended N-S and is best defined on the E flank. ... Simon Marius, a contemporary of Galileo, was the first to examine it through the telescope on Dec. 15th, 1612 and described it in the preface to his Mundus Jovialis as,
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www.kopernik.org/images/archive/m31.htm
www.kopernik.org/images/archive/m31.htm
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The Andromeda galaxy, M 31. Authors: Tenjes, P.; Haud, U.; Einasto, J. .... 2 the observational data used in the modelling process are described. .... Horizontal bars denote the mean dispersions calculated from our best fit model at the ...
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adsabs.harvard.edu/full/1994A&A...286..753T
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