GALAXIES

Galaxies are large collections of many millions or billions of stars, along with dust and gas, that are held together by their mutual gravitational attraction. They can be grouped into three main categories: spiral galaxies, like our own Milky Way, which contain both young and old stars as well as gas and dust; early-type galaxies including ellipticals, which contain mostly older stars, and little gas or dust, and which are round or elliptical in shape; and irregular galaxies, whose shapes do not fit into the scheme described above. Some irregular galaxies are dwarfs, which, as their name implies, are generally smaller in size and less luminous. Another class of galaxies is peculiar galaxies, which are thought to be distorted normal galaxies. All galaxies are thought to contain significant amounts of "dark matter" which contributes to the gravitational force but which has yet to be detected by other means. Galaxies may be clustered into groups containing a few to a dozen members, clusters of galaxies which may contain hundreds or thousands of members, or into superclusters that contain tens of thousands of galaxies.

Many galaxies are "active", meaning that they contain central sources of intense optical, radio, and/or X-ray emission. Images of such galaxies are catalogued separately in the class of Active Galactic Nuclei.

Click on any Sub-category name below to view all the images in that sub-category, or click any thumbnail to view the details of that image. Other images of the atomic hydrogen in galaxies can be found in the HI Rogues Gallery. Visit this non-NRAO website for more information about galaxies.


Spiral (22 images)
M51
M51
M33
M33
M33
M33
m81
m81
IC342
IC342
Milky Way
Milky Way

Early-type (3 images)
NGC2865
NGC2865
NGC5018
NGC5018
NGC1316
NGC1316

Dwarf (5 images)
NGC2537
NGC2537
NGC3664
NGC3664
UGC5391
UGC5391
He 2-10
He 2-10
NGC 4449
NGC 4449

Peculiar (16 images)
M81 group
M81 group
NGC4038
NGC4038
NGC4038
NGC4038
UGC813
UGC813
Arp220
Arp220
NGC7252
NGC7252

Clusters (5 images)
Virgo Cluster
Virgo Cluster
Abell 2255
Abell 2255
Virgo Cluster
Virgo Cluster
HCG 007
HCG 007
COSMOS field
COSMOS field

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