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Groups of stars

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A galaxy is an assembly of stars. The mass of a galaxy is an order of magnitude greater than one hundred million solar masses. Galaxies interact with their neighbors and these interactions change their shape. Two or more galaxies sometimes merge. The galaxies are of three types: elliptical, spiral, irregular.

 

Like the stars, which are grouped into galaxies, most galaxies are gravitationally bound together.
The structure that holds up to fifty galaxies is called group of galaxies. The structure containing thousands of galaxies grouped in a few megaparsecs sector is a cluster of galaxies.

 

Groups and clusters of galaxies are themselves grouped into superclusters, giant collections containing tens of thousands of galaxies.
In very large scale distribution of galaxy clusters is not uniform, but organized in sheets or filaments.

fusion of galaxiesGravitational Illusion or Gravitational lens
Fusion galaxies
and black holes...
Gravitational illusion...
  
sky background of the universeLimitations of Bigbang - horizon problem
Still closer to
Big Bang, the universe...
Big Bang mystery,
horizon problem...
  
Cosmic event of the Cartwheel galaxyThe first second
Cosmic event of the
Cartwheel galaxy...
The first second
of our history...
  
Expansion of the universe, Big BangCollision of two galaxies, small tears great NGC 6745
From the Big Bang
to galaxies...
A small small tears
great NGC 6745...
  
Coma cluster of galaxiesThe problem of the rotation curve of a galaxy
Coma cluster of galaxies
into its soup...
MOND theory
and its contradiction...
  
Cluster of galaxies El GordoEinstein ring and Einstein cross
The heavier cluster
of galaxies, El Gordo...
Einstein ring and
Einstein cross...
 
galaxy M51center of the galaxy, the Milky Way center
Galaxies
practice cannibalism...
Journey to the center
of our Galaxy...
  
Lyman-apha Blob (LAB)galaxie Andromède ou M31
Bubbles Lyman-alpha,
early galaxies...
Andromeda
in the ultraviolet...
  
Galaxy groupsFusion of three galaxies - Tinker Bell
The most beautiful
clusters of galaxies...
Fusion of three galaxies
Tinker Bell...
  
Super giant black hole in NGC 1277Enigma of coplanar galaxies of Andromeda
A gigantic black hole
in NGC 1277...
Enigma of coplanar
galaxies of Andromeda...
  
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Bullet cluster,
evidence of dark matter...
Astronomical terms
in SMS format...
  
Laniakea, notre superamas de galaxiesGould Belt
The sky is huge
with Laniakea...
The Gould Belt, a
stellar fireworks...
 
séquence de hubblegalactic arms
Sequence of Hubble
and types of galaxies...
Form galactic
spiral arms...
  
Cigar galaxy or M82The X-ray Universe
Still more stars
in the Cigar galaxy...
The X-ray Universe...
  
The most beautiful galaxiesThe oldest galaxies in the universe
The most beautiful
galaxies...
The oldest galaxies
in the universe...
  
Quasars the cores of galaxiesSagittarius A black hole at the center of our Galaxy
Quasars cores
of galaxies...
Sagittarius A, our
black hole in 2013...
  
supernova SN 2014J in cigar galaxyShock wave Kappa Cassiopeia
The explosion of the
Cigar...
Shock waves...
 
  
Milky WayRecombination in cosmology
Central area
of the Milky Way...
Recombination
in cosmology...
 
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