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Vital articles is a list of subjects for which Wikipedia should have corresponding high-quality articles. It serves as a centralized watchlist to track the status of Wikipedia's most essential articles. This is one of the sub-lists of the fifty thousand article Vital articles/Level 5 and is currently under construction.

Articles in the Vital list have their assessments labelled as:

  • Featured articles
  • Former featured articles
  • A-class articles
  • Good articles
  • Delisted good articles
  • Failed good article nominees
  • B-class articles
  • C-class articles
  • Start-class articles
  • Stub-class articles
  • List-class articles
  • Unassessed articles

The progress bar is auto-updated via category count, and the symbols and article counts are updated daily by User:cewbot. Please read the FAQ before modifying the article list.

For astronomical instruments, see the Astronomical technology (Level 5) section

Quota 900 articles.

Total 899 articles.

Class #Articles
FA 110
FL 5
GA 45
B 136
C 340
LIST 3
FFA 14
DGA 11
FFLC 2
Start 239
Stub 21

Astronomy basics

This section contains 37 articles.

  1. Astronomy (Level 2)
  2. Astronomical object (Level 4)
    1. Interstellar object
    2. Substellar object
  3. Astrophysics (Level 4)
  4. Astronomer
  5. Astrobiology
    1. Extraterrestrial life (Level 4)
    2. Extraterrestrial intelligence
    3. Search for extraterrestrial intelligence
    4. Great Filter
    5. Fermi paradox
  6. Astrochemistry
    1. Cosmochemistry
    2. Hypothetical types of biochemistry
    3. List of interstellar and circumstellar molecules
  7. Cosmology
  8. Space physics
  9. Theoretical astronomy
  10. Computational astrophysics
  11. Gravitational-wave astronomy
  12. Neutrino astronomy
  13. Time-domain astronomy
  14. Night sky
  15. Amateur astronomy
    1. Astrophotography
  16. Space weather

Databases

This section contains 4 articles.

  1. Astrophysics Data System
  2. SIMBAD
  3. NASA/IPAC Extragalactic Database
  4. VizieR

Surveys and Catalogs

This section contains 6 articles.

  1. Messier object
  2. Henry Draper Catalogue
  3. New General Catalogue
  4. Uppsala General Catalogue
  5. 2MASS
  6. Sloan Digital Sky Survey

Observational astronomy

This section contains 49 articles.

Basics

This section contains 36 articles.

  1. Observatory (Level 4)
  2. Luminosity (Level 4)
    1. Sky brightness
    2. Airglow
  3. Magnitude (astronomy) (Level 4)
    1. Absolute magnitude
    2. Apparent magnitude
  4. Extinction (astronomy) (Level 4)
  5. Effective temperature
  6. Light curve
  7. Photometry (astronomy) (Level 4)
    1. Photometric system
      1. UBV photometric system
  8. Cosmic distance ladder (Level 4)
    1. Stellar parallax
    2. Tip of the red-giant branch
    3. Planetary nebula luminosity function
  9. Astrometry (Level 4)
    1. Proper motion
    2. Radial velocity
    3. Parallax (Level 4)
  10. Polarization in astronomy
  11. Astronomical spectroscopy
    1. Forbidden mechanism
  12. Infrared astronomy
  13. Visible-light astronomy
  14. Air mass (astronomy)
  15. Astronomical seeing
  16. Twinkling
  17. Luminosity distance
  18. Recessional velocity
  19. Spectral energy distribution
  20. Surface brightness
  21. Angular resolution
  22. Angular diameter
  23. Bortle scale

Radio astronomy

This section contains 8 articles.

  1. Radio astronomy
    1. Radio spectrum pollution
  2. Submillimetre astronomy
  3. Astronomical radio source
  4. Astrophysical maser
    1. Megamaser
  5. Brightness temperature
  6. Spectral index

High-energy astronomy

This section contains 5 articles.

  1. High-energy astronomy
  2. Ultraviolet astronomy
  3. X-ray astronomy
    1. Astrophysical X-ray source
  4. Gamma-ray astronomy

Astronomical objects

This section contains 303 articles.

Solar System

This section contains 130 articles.

  1. Solar System (Level 2)
    1. Formation and evolution of the Solar System (Level 4)
      1. Nebular hypothesis (Level 4)
      2. Nice model
    2. Interplanetary medium (Level 4)
      1. Gegenschein
      2. Interplanetary dust cloud
  2. Sun (Level 2)
    1. Solar wind (Level 4)
    2. Solar core
    3. Solar cycle
    4. Photosphere
    5. Chromosphere
    6. Stellar corona
    7. Heliosphere
    8. Solar neutrino
    9. Coronal mass ejection
    10. Solar phenomena
    11. Solar flare
    12. Solar storm
    13. Sunspot
  3. Mercury (planet) (Level 3)
    1. Atmosphere of Mercury
    2. Geology of Mercury
  4. Venus (Level 3)
    1. Atmosphere of Venus
    2. Geology of Venus
  5. Earth (Level 1)
    1. Earth's orbit
    2. Earth's shadow
    3. Earthlight (astronomy)
    4. Location of Earth
    5. Future of Earth
  6. Moon (Level 2)
    1. Origin of the Moon
      1. Giant-impact hypothesis
      2. Theia (planet)
    2. Orbit of the Moon
    3. Selenography
      1. Near side of the Moon
      2. Far side of the Moon
      3. Lunar south pole
    4. Geology of the Moon
    5. Internal structure of the Moon
  7. Near-Earth object
  8. Mars (Level 3)
    1. Atmosphere of Mars
    2. Geology of Mars
      1. Geological history of Mars
      2. Olympus Mons
      3. Martian polar ice caps
    3. Life on Mars
    4. Moons of Mars
      1. Phobos (moon)
      2. Deimos (moon)
  9. Asteroid belt (Level 4)
    1. Ceres (dwarf planet) (Level 4)
    2. 2 Pallas
    3. 3 Juno
    4. 4 Vesta
    5. 10 Hygiea
    6. 243 Ida
    7. 433 Eros
  10. Jupiter (Level 3)
    1. Atmosphere of Jupiter
      1. Great Red Spot
    2. Magnetosphere of Jupiter
    3. Rings of Jupiter
    4. Moons of Jupiter
      1. Galilean moons
      2. Io (moon) (Level 4)
      3. Europa (moon) (Level 4)
      4. Ganymede (moon) (Level 4)
      5. Callisto (moon) (Level 4)
    5. Jupiter trojan
  11. Saturn (Level 3)
    1. Magnetosphere of Saturn
    2. Rings of Saturn
    3. Saturn's hexagon
    4. Moons of Saturn
      1. Mimas
      2. Enceladus (Level 4)
      3. Tethys (moon)
      4. Dione (moon)
      5. Rhea (moon)
      6. Titan (moon) (Level 4)
        1. Lakes of Titan
      7. Iapetus (moon)
  12. Uranus (Level 3)
    1. Atmosphere of Uranus
    2. Rings of Uranus
    3. Moons of Uranus
      1. Ariel (moon)
      2. Umbriel
      3. Titania (moon)
      4. Oberon (moon)
      5. Miranda (moon)
  13. Neptune (Level 3)
    1. Rings of Neptune
    2. Moons of Neptune
      1. Triton (moon) (Level 4)
    3. Great Dark Spot
  14. Trans-Neptunian object
  15. Kuiper belt (Level 4)
    1. Pluto (Level 4)
      1. Atmosphere of Pluto
      2. Moons of Pluto
        1. Charon (moon)
    2. Orcus (dwarf planet)
    3. Haumea
      1. Moons of Haumea
    4. Makemake
    5. Gonggong (dwarf planet)
    6. Quaoar
    7. 486958 Arrokoth
  16. Scattered disc
    1. Eris (dwarf planet) (Level 4)
      1. Dysnomia (moon)
  17. Oort cloud (Level 4)
    1. Hills cloud
    2. Sedna (dwarf planet)
    3. Sednoid
  18. Planets beyond Neptune
    1. Planet Nine

Notable comets

This section contains 6 articles.

  1. Halley's Comet (Level 4)
  2. Comet Hyakutake
  3. Comet Hale–Bopp
  4. Comet Shoemaker–Levy 9
  5. 2060 Chiron
  6. Kreutz sungrazer

Notable stars

This section contains 47 articles.

  1. Achernar
  2. Aldebaran
  3. Algol
  4. Alpha Centauri (Level 4)
    1. Proxima Centauri
  5. Acrux
  6. Altair
  7. Antares
  8. Arcturus (Level 4)
  9. Barnard's Star
  10. Beta Centauri
  11. Beta Pictoris
  12. Betelgeuse (Level 4)
  13. Canopus (Level 4)
  14. Capella (Level 4)
  15. Castor (star)
  16. Crab Pulsar
  17. CW Leonis
  18. Cygnus X-1 (Level 4)
  19. Deneb
  20. Epsilon Canis Majoris
  21. Epsilon Eridani
  22. Eta Carinae
  23. Fomalhaut
  24. Gamma Cassiopeiae
  25. LBV 1806−20
  26. Mimosa (star)
  27. Mira
  28. Polaris (Level 4)
  29. Pi Puppis
  30. Pollux (star)
  31. Procyon (Level 4)
  32. PSR B1937+21
  33. Regulus
  34. Rigel (Level 4)
  35. Scorpius X-1
  36. Sirius (Level 4)
  37. Spica
  38. Tabby's Star
  39. Tau Ceti
  40. TRAPPIST-1
  41. TW Hydrae
  42. UY Scuti
  43. Vega (Level 4)
  44. VY Canis Majoris
  45. WISE 0855−0714
  46. Zeta Ophiuchi

Notable exoplanets

This section contains 11 articles.

  1. 51 Pegasi b
  2. 55 Cancri e
  3. Gliese 581d
  4. HD 189733 b
  5. HD 209458 b
  6. K2-18b
  7. Kepler-22b
  8. Kepler-186f
  9. Kepler-442b
  10. Kepler-452b
  11. Proxima Centauri b

Milky Way

This section contains 7 articles.

  1. Milky Way (Level 3)
  2. Galactic Center (Level 4)
    1. Sagittarius A
      1. Sagittarius A* (Level 4)
  3. Orion Arm
  4. Perseus Arm
  5. Scutum–Centaurus Arm

Notable galaxies

This section contains 35 articles.

  1. Local Group (Level 4)
    1. Andromeda Galaxy (Level 4)
    2. Satellite galaxies of the Milky Way
      1. Magellanic Clouds
      2. Large Magellanic Cloud (Level 4)
      3. Small Magellanic Cloud (Level 4)
      4. Sagittarius Dwarf Spheroidal Galaxy
    3. Triangulum Galaxy (Level 4)
    4. Virgocentric flow
  2. 3C 273 (Level 4)
  3. Antennae Galaxies
  4. Arp 220
  5. BL Lacertae
  6. Cartwheel Galaxy
  7. Centaurus A (Level 4)
  8. Cygnus A
  9. Hoag's Object
  10. IC 1101
  11. Markarian 421
  12. Markarian 501
  13. Messier 49
  14. Messier 77
  15. Messier 81
  16. Messier 82
  17. Messier 83
  18. Messier 87 (Level 4)
  19. Messier 106
  20. NGC 1275
  21. NGC 4151
  22. NGC 5548
  23. NGC 6946
  24. Pinwheel Galaxy (Level 4)
  25. Sculptor Galaxy
  26. Sombrero Galaxy
  27. Whirlpool Galaxy (Level 4)

Notable nebulae

This section contains 21 articles.

  1. Carina Nebula (Level 4)
  2. Cassiopeia A
  3. Cat's Eye Nebula
  4. Coalsack Nebula
  5. Crab Nebula (Level 4)
  6. Cygnus Loop
  7. Dumbbell Nebula
  8. Eagle Nebula (Level 4)
  9. Horsehead Nebula (Level 4)
  10. Lagoon Nebula
  11. NGC 6302
  12. NGC 7027
  13. Omega Nebula
  14. Orion Nebula (Level 4)
  15. Rho Ophiuchi cloud complex
  16. Ring Nebula (Level 4)
  17. Rosette Nebula
  18. Sagittarius B2
  19. Tarantula Nebula
  20. Trifid Nebula
  21. Westerhout 40

Notable star clusters

This section contains 13 articles.

  1. 47 Tucanae
  2. Beehive Cluster
  3. Double Cluster
  4. Hyades (star cluster) (Level 4)
  5. Messier 4
  6. Messier 7
  7. Messier 13
  8. Messier 15
  9. Messier 22
  10. Omega Centauri (Level 4)
  11. Pleiades (Level 4)
  12. R136
  13. Trapezium Cluster

Notable galaxy clusters

This section contains 14 articles.

  1. Virgo Supercluster (Level 4)
    1. Virgo Cluster (Level 4)
  2. Laniakea Supercluster
  3. Centaurus A/M83 Group
  4. Coma Cluster
  5. Fornax Cluster
  6. IC 342/Maffei Group
  7. M81 Group
  8. Perseus Cluster
  9. Great Attractor (Level 4)
  10. Bullet Cluster
  11. Shapley Supercluster
  12. Pisces–Cetus Supercluster Complex
  13. Local Sheet

Notable transient events

This section contains 7 articles.

  1. Kepler's Supernova
  2. SN 1006
  3. SN 1054
  4. SN 1572
  5. SN 1972E
  6. SN 1987A
  7. GW170817

Notable patches of universe

This section contains 14 articles.

  1. Local Bubble
    1. Local Interstellar Cloud
    2. G-Cloud
  2. Hubble Deep Field
  3. Hubble Ultra-Deep Field
  4. Local Hole
  5. Zone of Avoidance
  6. Boötes Void
  7. CMB cold spot
  8. Local Void
  9. Giant Void
  10. South Pole Wall
  11. Huge-LQG
  12. BOSS Great Wall

Other notable objects

This section contains 4 articles.

  1. ʻOumuamua
  2. 2I/Borisov
  3. Magellanic Stream
  4. Dipole repeller

Celestial mechanics

This section contains 72 articles.

  1. Celestial mechanics (Level 4)
  2. Orbit (Level 3)
    1. Barycenter (astronomy) (Level 4)
    2. Tidal locking (Level 4)
    3. Orbital eccentricity
    4. Orbital elements
    5. Orbital inclination
  3. Eclipse (Level 4)
    1. Eclipse cycle
    2. Lunar eclipse (Level 4)
    3. Saros (astronomy)
    4. Solar eclipse (Level 4)
    5. Umbra, penumbra and antumbra
  4. Astronomical transit
    1. Transit of Mercury
    2. Transit of Venus
  5. Kepler's laws of planetary motion (Level 4)
  6. Lagrange point (Level 4)
  7. Libration
  8. Sidereal time
    1. Daylight
    2. Dawn
    3. Twilight
    4. Sunrise
    5. Morning
    6. Daytime
    7. Noon
    8. Afternoon
    9. Evening
    10. Sunset
    11. Dusk
    12. Night (Level 4)
    13. Midnight
    14. Midnight sun
    15. Polar night
    16. Zodiacal light
    17. Belt of Venus
    18. Blue hour
    19. Golden hour (photography)
    20. Terminator (solar)
  9. Lunar phase
    1. Full moon
    2. New moon
    3. Supermoon
  10. Apsis
  11. Gravitational collapse
  12. Axial precession
  13. Accretion (astrophysics)
  14. Velocity dispersion
  15. Roche limit
  16. Tidal acceleration

Orbital mechanics

This section contains 21 articles.

  1. Orbital mechanics (Level 4)
    1. Space rendezvous
    2. Orbital resonance
    3. Orbital station-keeping
  2. Escape velocity (Level 4)
    1. Bi-elliptic transfer
    2. Hohmann transfer orbit
  3. Geostationary orbit (Level 4)
  4. Geosynchronous orbit (Level 4)
    1. Molniya orbit
  5. Gravity assist (Level 4)
    1. Oberth effect
  6. Low Earth orbit (Level 4)
    1. Frozen orbit
    2. Sun-synchronous orbit
    3. Polar orbit
  7. Halo orbit
  8. Lissajous orbit
  9. Co-orbital configuration
    1. Horseshoe orbit
  10. Graveyard orbit

Celestial sphere

This section contains 121 articles.

Celestial sphere: General

This section contains 29 articles.

  1. Celestial sphere (Level 4)
  2. Celestial cartography
  3. Constellation (Level 4)
  4. Asterism (astronomy)
  5. Spherical astronomy
  6. Epoch (astronomy)
  7. Astronomical coordinate systems (Level 4)
    1. Equatorial coordinate system (Level 4)
    2. Equinox (celestial coordinates)
      1. Right ascension
      2. Declination
    3. Galactic coordinate system
  8. List of Chinese star names
  9. Equinox (Level 4)
    1. March equinox
    2. September equinox
  10. Ecliptic (Level 4)
  11. Horizon (Level 4)
  12. Solstice (Level 4)
    1. Summer solstice
    2. Winter solstice
  13. Hour angle
  14. Position angle
  15. Meridian (astronomy)
  16. Nadir
  17. Zenith
  18. Celestial equator
  19. Tropical year
  20. Zodiac (Level 4)

Asterism

This section contains 4 articles.

  1. Argo Navis
  2. Big Dipper
  3. Orion's Belt
  4. Quadrans Muralis

Constellations

This section contains 88 articles.

Zodiac

This section contains 12 articles.

  1. Aquarius (constellation)
  2. Aries (constellation)
  3. Cancer (constellation)
  4. Capricornus
  5. Gemini (constellation)
  6. Leo (constellation)
  7. Libra (constellation)
  8. Pisces (constellation)
  9. Sagittarius (constellation)
  10. Scorpius
  11. Taurus (constellation)
  12. Virgo (constellation)

Other

This section contains 76 articles.

  1. Andromeda (constellation)
  2. Antlia
  3. Apus
  4. Aquila (constellation)
  5. Ara (constellation)
  6. Auriga
  7. Boötes
  8. Caelum
  9. Camelopardalis
  10. Canes Venatici
  11. Canis Major (Level 4)
  12. Canis Minor
  13. Carina (constellation)
  14. Cassiopeia (constellation) (Level 4)
  15. Centaurus (Level 4)
  16. Cepheus (constellation)
  17. Cetus
  18. Chamaeleon
  19. Circinus
  20. Columba (constellation)
  21. Coma Berenices
  22. Corona Australis
  23. Corona Borealis
  24. Corvus (constellation)
  25. Crater (constellation)
  26. Crux (Level 4)
  27. Cygnus (constellation)
  28. Delphinus
  29. Dorado
  30. Draco (constellation)
  31. Equuleus
  32. Eridanus (constellation)
  33. Fornax
  34. Grus (constellation)
  35. Hercules (constellation)
  36. Horologium (constellation)
  37. Hydra (constellation)
  38. Hydrus
  39. Indus (constellation)
  40. Lacerta
  41. Leo Minor
  42. Lepus (constellation)
  43. Lupus (constellation)
  44. Lynx (constellation)
  45. Lyra
  46. Mensa (constellation)
  47. Microscopium
  48. Monoceros
  49. Musca
  50. Norma (constellation)
  51. Octans
  52. Ophiuchus
  53. Orion (constellation) (Level 4)
  54. Pavo (constellation)
  55. Pegasus (constellation)
  56. Perseus (constellation)
  57. Phoenix (constellation)
  58. Pictor
  59. Piscis Austrinus
  60. Puppis
  61. Pyxis
  62. Reticulum
  63. Sagitta
  64. Sculptor (constellation)
  65. Scutum (constellation)
  66. Serpens
  67. Sextans
  68. Telescopium
  69. Triangulum
  70. Triangulum Australe
  71. Tucana
  72. Ursa Major (Level 4)
  73. Ursa Minor (Level 4)
  74. Vela (constellation)
  75. Volans
  76. Vulpecula

Planetary science

This section contains 51 articles.

  1. Planetary science
  2. Planet (Level 3)
    1. Definition of planet
      1. IAU definition of planet
        1. Clearing the neighbourhood
    2. Terrestrial planet (Level 4)
      1. Carbon planet
      2. Iron planet
    3. Giant planet (Level 4)
      1. Gas giant
      2. Ice giant
      3. Chthonian planet
    4. Exoplanet (Level 4)
      1. Rogue planet
      2. Hot Jupiter
      3. Super-Earth
      4. Earth analog
  3. Atmosphere (Level 4)
    1. Extraterrestrial vortex
  4. Magnetosphere
  5. Ring system (Level 4)
  6. Minor planet (Level 4)
    1. Asteroid (Level 3)
      1. Asteroid family
    2. Dwarf planet (Level 4)
    3. Minor-planet moon
  7. Natural satellite (Level 3)
    1. Satellite system (astronomy)
    2. Exomoon
  8. Comet (Level 3)
    1. Sungrazing comet
  9. Meteoroid (Level 4)
    1. Bolide
    2. Meteor shower (Level 4)
  10. Impact event (Level 4)
  11. Trojan (celestial body)
  12. Centaur (small Solar System body)
  13. Axial tilt
  14. Planetary differentiation
  15. Planetary habitability
    1. Habitable zone
    2. Galactic habitable zone
    3. Drake equation
    4. Rare Earth hypothesis
  16. Planetesimal
  17. Protoplanet
  18. Albedo (Level 4)
    1. Geometric albedo
  19. Methods of detecting exoplanets
  20. Planetary core
  21. Planetary mass

Stellar astronomy

This section contains 119 articles.

  1. Star (Level 3)
  2. Variable star (Level 4)
    1. Cataclysmic variable star
      1. Nova (Level 4)
    2. Cepheid variable (Level 4)
      1. Classical Cepheid variable
      2. RR Lyrae variable
      3. Type II Cepheid
    3. Flare star
    4. Luminous blue variable
    5. Mira variable
    6. T Tauri star
    7. Herbig Ae/Be star
    8. Instability strip
  3. Star system (Level 4)
    1. Planetary system (Level 4)
    2. Binary star (Level 4)
      1. Binary pulsar
      2. Common envelope
      3. X-ray binary
      4. Roche lobe
  4. Star cluster (Level 4)
    1. Stellar association
    2. Open cluster
    3. Globular cluster
      1. Blue straggler
    4. Super star cluster
  5. Compact object
    1. White dwarf (Level 4)
      1. Black dwarf
      2. Chandrasekhar limit
    2. Neutron star (Level 4)
      1. Pulsar (Level 4)
      2. X-ray pulsar
      3. Magnetar
      4. Radio-quiet neutron star
    3. Exotic star
      1. Quark star
      2. Electroweak star
  6. Intergalactic star
  7. Stellar classification (Level 4)
    1. Main sequence (Level 4)
      1. Red dwarf
    2. Subdwarf
    3. Subgiant
    4. Giant star (Level 4)
      1. Blue giant
      2. Red giant (Level 4)
    5. Carbon star
    6. S-type star
    7. Supergiant (Level 4)
      1. Blue supergiant
      2. Yellow supergiant
      3. Red supergiant
    8. Hypergiant
    9. Wolf–Rayet star (Level 4)
    10. Be star
    11. B[e] star
  8. Stellar evolution (Level 4)
    1. Red-giant branch
    2. Helium flash
    3. Asymptotic giant branch
    4. Horizontal branch
  9. Star formation (Level 4)
    1. Starburst galaxy (Level 4)
    2. Starburst region
    3. Jeans instability
    4. Pre-stellar core
    5. Protostar (Level 4)
    6. Hayashi track
    7. Pre-main-sequence star
    8. Young stellar object
    9. Herbig–Haro object
  10. Stellar kinematics (Level 4)
  11. Stellar magnetic field (Level 4)
  12. Stellar nucleosynthesis
    1. Proton–proton chain
    2. CNO cycle
    3. Triple-alpha process
    4. Carbon-burning process
    5. s-process
    6. r-process
  13. Stellar structure (Level 4)
    1. Stellar core
    2. Radiative zone
    3. Convection zone
    4. Stellar atmosphere
  14. Stellar rotation
  15. Stellar mass
    1. Initial mass function
  16. Stellar wind
  17. Metallicity (Level 4)
    1. Chemically peculiar star
  18. Circumstellar disc
    1. Debris disk
    2. Protoplanetary disk
    3. Proplyd
  19. Brown dwarf (Level 4)
    1. Sub-brown dwarf
  20. Hertzsprung–Russell diagram (Level 4)
  21. Double star
  22. Protoplanetary nebula
  23. Planetary nebula (Level 4)
  24. Supernova (Level 3)
    1. Hypernova
    2. Type Ia supernova
    3. Type Ib and Ic supernovae
    4. Type II supernova
    5. Superluminous supernova
    6. Pair-instability supernova
    7. Supernova nucleosynthesis
    8. Supernova remnant
  25. Gamma-ray burst (Level 4)
    1. Gamma-ray burst emission mechanisms
    2. Gamma-ray burst progenitors
  26. Fast radio burst
  27. Kilonova
  28. Asteroseismology
  29. Mass–luminosity relation

Galactic and extragalactic astronomy

This section contains 93 articles.

Basics

This section contains 56 articles.

  1. Galactic astronomy
  2. Extragalactic astronomy
  3. Outer space (Level 3)
  4. Galaxy (Level 3)
    1. Galaxy formation and evolution (Level 4)
  5. Astrophysical jet
  6. Cosmic dust
  7. Black hole (Level 3)
    1. Supermassive black hole (Level 4)
    2. Stellar black hole
    3. Intermediate-mass black hole
    4. Micro black hole
    5. Kugelblitz (astrophysics)
    6. Accretion disk
    7. Event horizon (Level 4)
      1. Schwarzschild radius
  8. Interstellar medium (Level 4)
    1. Interstellar cloud
    2. Interstellar ice
    3. Nebula (Level 4)
    4. Dark nebula (Level 4)
      1. Bok globule
    5. Reflection nebula
    6. Emission nebula
    7. Molecular cloud (Level 4)
    8. Superbubble
    9. H I region
    10. H II region (Level 4)
  9. High-velocity cloud
  10. Cosmic ray (Level 4)
    1. Ultra-high-energy cosmic ray
  11. Galactic plane
    1. Thin disk
    2. Thick disk
  12. Galactic bulge
  13. Galaxy rotation curve
  14. Galactic halo
    1. Dark matter halo
  15. Interacting galaxy
    1. Galaxy merger
      1. Andromeda–Milky Way collision
    2. Galactic tide
  16. Satellite galaxy
  17. Galaxy groups and clusters (Level 4)
    1. Galaxy cluster
    2. Galaxy group
    3. Supercluster (Level 4)
  18. Gravitational lens
    1. Strong gravitational lensing
    2. Weak gravitational lensing
  19. Intergalactic dust
    1. Intracluster medium
  20. Warm–hot intergalactic medium
  21. Field galaxy
  22. Dark flow
  23. Wormhole

Large-scale structures

This section contains 3 articles.

  1. Galaxy filament
  2. Large quasar group
  3. Void (astronomy) (Level 4)

Galaxy classification

This section contains 24 articles.

  1. Galaxy morphological classification (Level 4)
  2. Hubble sequence
  3. Spiral galaxy (Level 4)
    1. Unbarred spiral galaxy
    2. Barred spiral galaxy (Level 4)
    3. Grand design spiral galaxy
    4. Flocculent spiral galaxy
    5. Magellanic spiral
    6. Density wave theory
    7. SSPSF model
    8. Tully–Fisher relation
  4. Elliptical galaxy (Level 4)
    1. Dwarf elliptical galaxy
    2. Type-cD galaxy
    3. Faber–Jackson relation
  5. Lenticular galaxy (Level 4)
  6. Irregular galaxy (Level 4)
  7. Dwarf galaxy (Level 4)
  8. Dark galaxy
  9. Brightest cluster galaxy
  10. Ring galaxy
  11. Low surface brightness galaxy
  12. Peculiar galaxy
  13. Lyman-alpha emitter

Active galactic nucleus

This section contains 10 articles.

  1. Active galactic nucleus (Level 4)
  2. Eddington luminosity
  3. Low-ionization nuclear emission-line region
  4. Seyfert galaxy (Level 4)
  5. Luminous infrared galaxy
  6. Radio galaxy (Level 4)
  7. Quasar (Level 4)
  8. Blazar (Level 4)
    1. BL Lacertae object
  9. Lyman-alpha forest

Physical cosmology

This section contains 54 articles.

  1. Physical cosmology (Level 3)
    1. Observational cosmology
  2. Universe (Level 2)
    1. Observable universe (Level 4)
      1. Cosmological horizon
        1. Particle horizon
      2. List of the most distant astronomical objects
    2. World
  3. Chronology of the universe (Level 4)
    1. Timeline of the early universe
    2. Age of the universe
    3. Big Bang (Level 3)
    4. Grand unification epoch
    5. Cosmic inflation (Level 4)
    6. Electroweak epoch
    7. Quark epoch
    8. Hadron epoch
    9. Lepton epoch
    10. Recombination (cosmology)
    11. Photon epoch
    12. Reionization
  4. Structure formation
  5. Shape of the universe
  6. Ultimate fate of the universe (Level 4)
    1. Heat death of the universe
    2. Big Rip
    3. Big Crunch
    4. Cyclic model
  7. Cosmic microwave background (Level 4)
    1. Discovery of cosmic microwave background radiation
  8. Cosmic neutrino background
  9. Big Bang nucleosynthesis
    1. Alpher–Bethe–Gamow paper
    2. Missing baryon problem
  10. Baryogenesis
  11. Expansion of the universe
    1. Accelerating expansion of the universe
    2. Scale factor (cosmology)
  12. Baryon acoustic oscillations
  13. Primordial fluctuations
  14. Dark matter (Level 4)
  15. Dark energy (Level 4)
    1. Cosmological constant (Level 4)
    2. Lambda-CDM model
    3. Quintessence (physics)
  16. Redshift (Level 4)
    1. Hubble's law (Level 4)
      1. Hubble volume
  17. Comoving and proper distances
  18. Anthropic principle
  19. Flatness problem
  20. Horizon problem
  21. Steady-state model
  22. Multiverse


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