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- Andromeda_Galaxy abstract "The Andromeda Galaxy (/ænˈdrɒmɨdə/), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. Being approximately 220,000 light years across, it is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 44 other smaller galaxies.The Andromeda Galaxy is the most massive galaxy in the Local Group as well. Despite earlier findings that suggested that the Milky Way contains more dark matter and could be the most massive in the grouping, the 2006 observations by the Spitzer Space Telescope revealed that Andromeda contains one trillion (1012) stars: at least twice the number of stars in the Milky Way, which is estimated to be 200–400 billion.The Andromeda Galaxy is estimated to be 1.5×1012 solar masses, while the mass of the Milky Way is estimated to be 8.5×1011 solar masses. In comparison, a 2009 study estimated that the Milky Way and M31 are about equal in mass, while a 2006 study put the mass of the Milky Way at ~80% of the mass of the Andromeda Galaxy. The Milky Way and Andromeda are expected to collide in 3.75 billion years, eventually merging to form a giant elliptical galaxy or perhaps a large disk galaxy.At 3.4, the apparent magnitude of the Andromeda Galaxy is one of the brightest of any of the Messier objects, making it visible to the naked eye on moonless nights even when viewed from areas with moderate light pollution. Although it appears more than six times as wide as the full Moon when photographed through a larger telescope, only the brighter central region is visible to the naked eye or when viewed using binoculars or a small telescope and would it hence appear to be but another star.".
- Andromeda_Galaxy thumbnail Andromeda_Galaxy_(with_h-alpha).jpg?width=300.
- Andromeda_Galaxy wikiPageExternalLink 060123_andromeda_plane.html.
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- Andromeda_Galaxy wikiPageExternalLink factsheet.php?p=M31.
- Andromeda_Galaxy wikiPageExternalLink CBAT_M31.html.
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- Andromeda_Galaxy wikiPageExternalLink full.
- Andromeda_Galaxy wikiPageExternalLink zoom.
- Andromeda_Galaxy wikiPageExternalLink m031.html.
- Andromeda_Galaxy wikiPageExternalLink sim-id.pl?Ident=M+31.
- Andromeda_Galaxy wikiPageExternalLink a-hundred-million-stars-in-3-minutes.
- Andromeda_Galaxy wikiPageExternalLink www.andromedaproject.org.
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- Andromeda_Galaxy wikiPageID "74331".
- Andromeda_Galaxy wikiPageLength "85254".
- Andromeda_Galaxy wikiPageOutDegree "241".
- Andromeda_Galaxy wikiPageRevisionID "683873813".
- Andromeda_Galaxy wikiPageWikiLink 1000000000000_(number).
- Andromeda_Galaxy wikiPageWikiLink 2MASS.
- Andromeda_Galaxy wikiPageWikiLink Abd_al-Rahman_al-Sufi.
- Andromeda_Galaxy wikiPageWikiLink Absolute_magnitude.
- Andromeda_Galaxy wikiPageWikiLink Absorption_lines.
- Andromeda_Galaxy wikiPageWikiLink Andromeda_(constellation).
- Andromeda_Galaxy wikiPageWikiLink Andromeda_(mythology).
- Andromeda_Galaxy wikiPageWikiLink Andromeda_Galaxy.
- Andromeda_Galaxy wikiPageWikiLink Andromeda–Milky_Way_collision.
- Andromeda_Galaxy wikiPageWikiLink Angular_diameter.
- Andromeda_Galaxy wikiPageWikiLink Apparent_magnitude.
- Andromeda_Galaxy wikiPageWikiLink Apsis.
- Andromeda_Galaxy wikiPageWikiLink Arcminute.
- Andromeda_Galaxy wikiPageWikiLink Astronomy_(magazine).
- Andromeda_Galaxy wikiPageWikiLink Astronomy_Picture_of_the_Day.
- Andromeda_Galaxy wikiPageWikiLink Barred_spiral_galaxy.
- Andromeda_Galaxy wikiPageWikiLink Binary_star.
- Andromeda_Galaxy wikiPageWikiLink Binoculars.
- Andromeda_Galaxy wikiPageWikiLink Black_hole.
- Andromeda_Galaxy wikiPageWikiLink Blueshift.
- Andromeda_Galaxy wikiPageWikiLink Book_of_Fixed_Stars.
- Andromeda_Galaxy wikiPageWikiLink Brady_Haran.
- Andromeda_Galaxy wikiPageWikiLink Bulge_(astronomy).
- Andromeda_Galaxy wikiPageWikiLink Catalonia.
- Andromeda_Galaxy wikiPageWikiLink Category:Andromeda_(constellation).
- Andromeda_Galaxy wikiPageWikiLink Category:Andromeda_Galaxy.
- Andromeda_Galaxy wikiPageWikiLink Category:Andromeda_Subgroup.
- Andromeda_Galaxy wikiPageWikiLink Category:Articles_containing_video_clips.
- Andromeda_Galaxy wikiPageWikiLink Category:Astronomical_objects_known_since_antiquity.
- Andromeda_Galaxy wikiPageWikiLink Category:IRAS_catalogue_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:Local_Group.
- Andromeda_Galaxy wikiPageWikiLink Category:MCG_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:Messier_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:NGC_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:PGC_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:UGC_objects.
- Andromeda_Galaxy wikiPageWikiLink Category:Unbarred_spiral_galaxies.
- Andromeda_Galaxy wikiPageWikiLink Cavendish_Astrophysics_Group.
- Andromeda_Galaxy wikiPageWikiLink Celestial_coordinate_system.
- Andromeda_Galaxy wikiPageWikiLink Cepheid.
- Andromeda_Galaxy wikiPageWikiLink Cepheid_variable.
- Andromeda_Galaxy wikiPageWikiLink Cepheid_variable_star.
- Andromeda_Galaxy wikiPageWikiLink Chandra_X-Ray_Observatory.
- Andromeda_Galaxy wikiPageWikiLink Chandra_X-ray_Observatory.
- Andromeda_Galaxy wikiPageWikiLink Charles_Messier.
- Andromeda_Galaxy wikiPageWikiLink Color-magnitude_diagram.
- Andromeda_Galaxy wikiPageWikiLink Color_index.
- Andromeda_Galaxy wikiPageWikiLink Cosmic_dust.
- Andromeda_Galaxy wikiPageWikiLink Cyril_Hazard.
- Andromeda_Galaxy wikiPageWikiLink Dark_matter.
- Andromeda_Galaxy wikiPageWikiLink Declination.
- Andromeda_Galaxy wikiPageWikiLink Degree_(angle).
- Andromeda_Galaxy wikiPageWikiLink Disc_(galaxy).
- Andromeda_Galaxy wikiPageWikiLink Disc_galaxy.
- Andromeda_Galaxy wikiPageWikiLink Disk_galaxy.
- Andromeda_Galaxy wikiPageWikiLink Doppler_effect.
- Andromeda_Galaxy wikiPageWikiLink Doppler_shift.
- Andromeda_Galaxy wikiPageWikiLink Dwarf_galaxy.
- Andromeda_Galaxy wikiPageWikiLink ESA.
- Andromeda_Galaxy wikiPageWikiLink Earth.
- Andromeda_Galaxy wikiPageWikiLink Eclipsing_binary.
- Andromeda_Galaxy wikiPageWikiLink Edwin_Hubble.
- Andromeda_Galaxy wikiPageWikiLink Elliptical_Galaxy_M110.
- Andromeda_Galaxy wikiPageWikiLink Elliptical_Galaxy_M32.
- Andromeda_Galaxy wikiPageWikiLink Elliptical_galaxy.
- Andromeda_Galaxy wikiPageWikiLink Epoch_(astronomy).
- Andromeda_Galaxy wikiPageWikiLink Ernst_Öpik.
- Andromeda_Galaxy wikiPageWikiLink European_Space_Agency.
- Andromeda_Galaxy wikiPageWikiLink File:Andromeda_Galaxy_(with_h-alpha).jpg.
- Andromeda_Galaxy wikiPageWikiLink File:Andromeda_galaxy_Ssc2005-20a1.jpg.