Local Group


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Related to Local Group: Local Supercluster

Local Group,

in astronomy, loose cluster of at least 40 nearby galaxiesgalaxy,
large aggregation of stars, gas, dust, and usually dark matter, typically containing billions of stars. Recognition that galaxies are independent star systems outside the Milky Way came from a study of the Andromeda Galaxy (1926–29) by Edwin P.
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, including our own 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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 galaxy, the Andromeda GalaxyAndromeda Galaxy,
cataloged as M31 and NGC 224, the closest large galaxy to the Milky Way 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.
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, and the Magellanic CloudsMagellanic Clouds
, two dwarf galaxies located in the far southern sky and visible to the unaided eye; they are classified as irregular because they show no definite symmetry or nucleus.
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. The Local Group is spread over an ellipsoidal region of space with a major axis of approximately 3 million light-years. The Milky Way galaxy, near one end of the major axis, and the Andromeda Galaxy, near the other end, are the largest members of the group; most of the galaxies are dwarf galaxies. Some of the galaxies in the group have been detected only by their infrared radiationinfrared radiation,
electromagnetic radiation having a wavelength in the range from c.75 × 10−6 cm to c.100,000 × 10−6 cm (0.000075–0.1 cm).
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; a dusty region in space obscures their visible light. There may be other galaxies in the Local Group that are as yet undetected. As shown by the work of G. de Vaucouleurs, the Local Group is part of a supercluster containing at least 50 separate clusters, each having from a few dozen to as many as a thousand galaxies. These groups appear to be concentrated in a plane, which indicates that the supercluster is rotating. Its center lies approximately 50 million light-years away in the direction of the constellation Virgo, and it is known as the Virgo Supercluster. It has since been determined that the Virgo Supercluster is part of the much larger Laniakea Supercluster, which spans some 500 million light-years.
Local Groupclick for a larger image
Local Group

Local Group

The cluster of galaxies of which our Galaxy is a member. It is a comparatively small cluster with around 40 known members and some other possible members, most of which are dwarf ellipticals or irregular galaxies (see table). The most massive members are the Galaxy and the Andromeda galaxy (M31). The other major members are the Triangulum spiral (M33) and the Large Magellanic Cloud. The group is irregular in shape with two notable subclusters: one around our Galaxy and the Magellanic Clouds, the other around M31 and M33.

Local Group

[′lō·kəl ′grüp]
(astronomy)
A group of at least 20 known galaxies in the vicinity of the sun; the Andromeda Spiral is the largest of the group, and the Milky Way Galaxy is the second largest.
References in periodicals archive ?
Government services company Perspecta Inc (NYSE:PRSP) reported on Wednesday the appointment of Rocky Thurston as senior vice president and general manager of its civilian, state and local group.
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FRAMPTON is backing the Lidl Community Works initiative which will give PS228,000 to local groups and projects through its stores across Northern Ireland.
The Local Group lies in a filament of a much larger cosmic structure.
The South Warwickshire Diabetes Local Group help people across Warwickshire who are living with or affected by diabetes.
The Local Group occupied a region of space that is about three million light years across - that is, a ray of light would take about three million years to cross the entire group.
HUBERT GIESCHEN, Chair, Newcastle local group, Tyne and Wear Public Transport Users Group
Why are we doing this trusted build activity without the local group having seen the customized code yet?
Jennie Francis tells us that she originally joined her local group after giving birth to her daughter last year and has gone on to lose 2st 9lbs.

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