Andromeda galaxy

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Andromeda Galaxy,

cataloged as M31 and NGC 224, the closest large galaxy to the Milky WayMilky Way,
the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon; if not blocked by the horizon, it would be seen as a circle around the entire sky.
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 and the only one visible to the naked eye in the Northern Hemisphere. It is also known as the Great Nebula in Andromeda. It is 2.2 million light-years away and is part of the Local GroupLocal Group,
in astronomy, loose cluster of at least 40 nearby galaxies, including our own Milky Way galaxy, the Andromeda Galaxy, and the Magellanic Clouds. The Local Group is spread over an ellipsoidal region of space with a major axis of approximately 3 million light-years.
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 of several galaxies that includes the Milky Way, which it largely resembles in shape and composition, although the Milky Way is a barred spiral galaxy and Andromeda is a spiral galaxy. It has a diameter of about 165,000 light-years and contains at least 200 billion stars. Its two brightest companion galaxies are M32 and M110. The light arriving at earth from the Andromeda Galaxy is shifted toward the blue end of the spectrum, whereas the light from all other cosmic sources exhibits red shiftred shift
or redshift,
in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect was discovered by V. M. Slipher of Lowell Observatory.
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Andromeda galaxy

(M31; NGC 224) The largest of the nearby galaxies, visible to the unaided eye as a faint oval patch of light in the constellation Andromeda. It is an intermediate (Sb) spiral (see Hubble classification), orientated at an angle of about 15° from the edge-on position, and has a bright elliptical-shaped nucleus. Its distance is currently estimated as 725 kiloparsecs (2.36 million light years). With a total luminosity roughly double that of our own Galaxy and an overall diameter of approximately 60 kiloparsecs, M31 is the largest of the established members of the Local Group. It has at least four elliptical satellites, including NGC 205 and NGC 221 (M32).
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Andromeda Galaxy

[‚an′dräm·ə·də ′gal·ək·sē]
The spiral galaxy of type Sb nearest to the Milky Way. Also known as Andromeda Nebula.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The M31 was made in 35 variations and grades from the Standard Grade to the TF Premier Grade with factory engraving and ventilated rib, which sold for $302 in 1931.
With more than twice the mass of Omega Centauri (the Milky Way's heftiest globular), G1 may be the remnant core of a stripped dwarf galaxy that was digested by M31 earlier in its history.
But that would have satisfied as an answer only if J0045+41 was located inside M31. Instead, a spectrum from the Hawaii-based Gemini-North telescope showed that at least one of the objects inside J0045+41 must be a supermassive black hole, and that allowed scientists to estimate its distance, which turned out to be far beyond the 2.5 million light-years away where Andromeda is.
Despite M31's large distance-2 1/2 million light-years--its hazy glow is visible to the unaided eye in a moderately dark sky.
"Earlier observations of the area between M31 and M33 suggested the presence of colder, neutral hydrogen, but we couldn't see any details to determine if it had a definitive structure or represented a new type of cosmic feature.
M31 shows up well in binoculars as a faint fuzzy patch of light.
Soldiers may have seen a video that has been circulating of an M31 GMLRS-Unitary rocket detonating through the roof of a building.
The M31 was built by a consortium of Colas Hungaria and Hidepito.
Figure-9 shows SEM image of geopolymer paste and mortar specimen M31, before temperature exposure.
This ribotype, designated M31, had genes for toxins A, B and CDT; an 18-bp deletion in the tcdC gene and was toxinotype III.
Then there are the aliens from Andromeda Galaxy M31 who have probably found Voyager 1 by now, which is the rocket ship we sent into space in 1977 to tell Extra Terrestrials, "Hi.