Astrophysics (Index)About

Andromeda

(M31, Messier 31, NGC 224)
(spiral galaxy in the Local Group)

Andromeda (M31 or Messier 31, NGC 224) is a spiral galaxy about two and a half million light-years away. It is within the Local Group and is the nearest galaxy to the Milky Way that is similar: the Local Group contains one more somewhat similar spiral galaxy that is substantially smaller, and numerous smaller dwarf satellite galaxies. Andromeda is somewhat larger than the Milky Way, with on the order of a trillion stars. Andromeda was observed before the current concept of a galaxy was established, at the time, known as the Great Andromeda Nebula. Characteristics:

Satellite galaxies of Andromeda are known as Andromeda I (or And I), Andromeda II, etc.


(galaxy,Local Group,spiral)
Further reading:
http://en.wikipedia.org/wiki/Andromeda_Galaxy
RedshiftParsecs
/Distance
Lightyears
/Lookback Years
  
.0002780kpc2.54MlyAndromeda
PrefixExample  
AndAnd IM31 satellites
AndromedaAndromeda IM31 satellites
Coordinates:M31
J004244.3+414209

Referenced by pages:
astronomical quantities
astronomical unit (AU)
constellation
galaxy main sequence
galaxy subgroup
HBK
hierarchical assembly of galaxies
hypergalaxy
luminous blue variable (LBV)
Large Magellanic Cloud (LMC)
Local Group (LG)
Triangulum Galaxy (M33)
Messier Catalog (M)
Milkomeda
Milky Way
Morgan classification
nebula
nova (N)
PAndAS
Principal Galaxies Catalog (PGC)
POINT-AGAPE
satellite galaxy
satellite plane problem
SKHB
spiral galaxy

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