Disk Galaxies

Disc galaxies are galaxies characterized by a disc, a flattened circular volume of stars. These galaxies may or may not include a central non-disc-like region (a galactic bulge).

Disc galaxy types include:

  • spiral galaxies
    • unbarred spiral galaxies (types S, SA)
    • barred spiral galaxies (type SB)
    • intermediate spiral galaxies (type SAB)
  • lenticular galaxies (types E8, S0, SA0, SB0, SAB0)
Galaxy
Morphology
  • Disc galaxy
  • Dwarf galaxy
    • elliptical
    • spheroidal
    • spiral
  • Elliptical galaxy
  • Irregular galaxy
    • barred
  • Lenticular galaxy
    • barred
    • unbarred
  • Ring galaxy
  • Spiral galaxy
    • barred
    • flocculent
    • grand design
    • intermediate
    • Magellanic
    • unbarred
  • Giant galaxy
    • cD-galaxy
    • D-galaxy
    • elliptical
Structure
  • Bar
  • Bulge
  • Dark matter halo
  • Disc
  • Galactic halo
    • corona
  • Galactic plane
  • Interstellar medium
  • Protogalaxy
  • Spiral arm
  • Supermassive black hole
Active nuclei
  • Blazar
  • LINER
  • Quasar
  • Radio galaxy
    • X-shaped
  • Relativistic jet
  • Seyfert galaxy
Energetic galaxies
  • LAE
  • LIRG
  • Starburst galaxy
    • BCD
    • Pea
Interaction
  • Field galaxy
  • Galactic tide
  • Galaxy groups and clusters
    • brightest cluster galaxy
    • fossil group
  • Interacting galaxy
    • merger
  • Satellite galaxy
  • Stellar stream
  • Superclusters
  • Walls
  • Void galaxy
  • Voids and supervoids
Lists
  • Clusters
  • Large quasar groups
  • Nearest galaxies
  • Polar-ring galaxies
  • Quasars
  • Spiral galaxies
  • Superclusters
  • Voids
See also
  • Dark galaxy
  • Faint blue galaxy
  • Galaxy formation and evolution
  • Intergalactic dust
  • Intergalactic stars
  • Intergalactic travel
  • Book:Galaxies
  • Category:Galaxies
  • Portal:Astronomy

Famous quotes containing the words disk and/or galaxies:

    “Unloved, that beech will gather brown,
    This maple burn itself away;

    Unloved, the sun-flower, shining fair,
    Ray round with flames her disk of seed,
    And many a rose-carnation feed
    With summer spice the humming air;”
    —Alfred Tennyson (1809–1892)

    “Don’t you see what’s at stake here? The ultimate aim of all science—to penetrate the unknown. Do you realize we know less about the earth we live on than about the stars and the galaxies of outer space? The greatest mystery is right here, right under our feet.”
    —Walter Reisch (1903–1963)