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Wikipedia:Vital articles/Level 5/Physical sciences/Astronomy

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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.

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Overview
Level 1 Level 2 Level 3 Level 4 Level 5
Level 5 Sublists

People History Geography Arts Everyday life Philosophy and religion Society and social sciences Biology and health sciences Physical sciences Technology Mathematics

Basics and measurement Astronomy Chemistry Earth science Physics

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

Quota 900 articles.

Total 901 articles.

More information Class, #Articles ...
Class#Articles
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FL2
GA38
B134
C389
LIST4
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DGA19
FFLC2
Start213
Stub10
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Astronomy

This section contains 901 articles.

Astronomy basics

This section contains 34 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. Computational astrophysics
  10. Time-domain astronomy
  11. Night sky
  12. Amateur astronomy
    1. Astrophotography
  13. Timeline of the far future

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 56 articles.

Basics

This section contains 43 articles.

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

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

Astronomical objects

This section contains 304 articles.

Solar System

This section contains 135 articles.

Solar System: General

This section contains 4 articles.

  1. Solar System (Level 2)
  2. Formation and evolution of the Solar System (Level 4)
    1. Nebular hypothesis (Level 4)
    2. Nice model

The Sun

This section contains 16 articles.

  1. Sun (Level 2)
  2. Chromosphere
  3. Coronal mass ejection
  4. Heliosphere
  5. Photosphere
  6. Solar wind (Level 4)
    1. Space weather
  7. Solar core
  8. Solar corona
  9. Solar cycle
  10. Solar flare
  11. Solar neutrino
  12. Solar phenomena
  13. Solar storm
  14. Stellar corona
  15. Sunspot

Interplanetary medium

This section contains 4 articles.

  1. Interplanetary medium (Level 4)
  2. Interplanetary dust cloud
    1. Zodiacal light
    2. Gegenschein

Inner Solar System

This section contains 41 articles.

Mercury

This section contains 2 articles.

  1. Mercury (planet) (Level 3)
  2. Geology of Mercury
Venus

This section contains 3 articles.

  1. Venus (Level 3)
  2. Atmosphere of Venus
  3. Geology of Venus
Earth

This section contains 17 articles.

  1. Earth (Level 1)
  2. Earth's orbit
  3. Earth's shadow
  4. Earthlight
  5. Future of Earth
  6. Location of Earth
The Moon

This section contains 11 articles.

  1. Moon (Level 2)
  2. Geology of the Moon
  3. Internal structure of the Moon
  4. Orbit of the Moon
  5. Origin of the Moon
    1. Giant-impact hypothesis
      1. Theia (hypothetical planet)
  6. Selenography
    1. Near side of the Moon
    2. Far side of the Moon
    3. Lunar south pole
Mars

This section contains 10 articles.

  1. Mars (Level 3)
  2. Atmosphere of Mars
  3. Geology of Mars
    1. Geological history of Mars
    2. Martian polar ice caps
    3. Olympus Mons
  4. Life on Mars
  5. Moons of Mars
    1. Phobos (moon)
    2. Deimos (moon)
Asteroids

This section contains 9 articles.

  1. Near-Earth object
    1. 433 Eros
  2. 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

Outer Solar System

This section contains 41 articles.

Jupiter

This section contains 12 articles.

  1. Jupiter (Level 3)
  2. Atmosphere of Jupiter
    1. Great Red Spot
  3. Jupiter trojan
  4. Magnetosphere of Jupiter
  5. Moons of Jupiter
    1. Galilean moons
      1. Io (moon) (Level 4)
      2. Europa (moon) (Level 4)
      3. Ganymede (moon) (Level 4)
      4. Callisto (moon) (Level 4)
  6. Rings of Jupiter
Saturn

This section contains 13 articles.

  1. Saturn (Level 3)
  2. Magnetosphere of Saturn
  3. 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 and rivers of Titan
    7. Iapetus (moon)
  4. Rings of Saturn
  5. Saturn's hexagon
Uranus

This section contains 9 articles.

  1. Uranus (Level 3)
  2. Atmosphere of Uranus
  3. Moons of Uranus
    1. Miranda (moon)
    2. Ariel (moon)
    3. Umbriel
    4. Titania (moon)
    5. Oberon (moon)
  4. Rings of Uranus
Neptune

This section contains 5 articles.

  1. Neptune (Level 3)
  2. Great Dark Spot
  3. Moons of Neptune
    1. Triton (moon) (Level 4)
  4. Rings of Neptune
Other

This section contains 2 articles.

  1. Centaur (small Solar System body)
    1. 2060 Chiron

Trans-Neptunian region

This section contains 22 articles.

  1. Trans-Neptunian object
  2. 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
  3. Scattered disc
    1. Eris (dwarf planet) (Level 4)
      1. Dysnomia (moon)
  4. Oort cloud (Level 4)
    1. Hills cloud
    2. Sednoid
      1. Sedna (dwarf planet)
  5. Planets beyond Neptune
    1. Planet Nine

Notable comets

This section contains 5 articles.

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

Interstellar objects passing through the solar system

This section contains 2 articles.

  1. 1I/ʻOumuamua
  2. 2I/Borisov

Milky Way galaxy

This section contains 104 articles.

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. Pollux (star)
  30. Procyon (Level 4)
  31. PSR B1937+21
  32. Regulus
  33. Rigel (Level 4)
  34. Scorpius X-1
  35. Sirius (Level 4)
  36. Spica
  37. Tabby's Star
  38. Tau Ceti
  39. TRAPPIST-1
  40. TW Hydrae
  41. UY Scuti
  42. Vega (Level 4)
  43. VY Canis Majoris
  44. WISE 0855−0714
  45. Zeta Ophiuchi

Exoplanets

This section contains 11 articles.

  1. 51 Pegasi b
  2. 55 Cancri Ae
  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

Nebulae

This section contains 20 articles.

H II regions

This section contains 10 articles.

  1. Carina Nebula (Level 4)
  2. Eagle Nebula (Level 4)
  3. Lagoon Nebula
  4. Omega Nebula
  5. Orion Nebula (Level 4)
  6. Rho Ophiuchi cloud complex
  7. Rosette Nebula
  8. Sagittarius B2
  9. Trifid Nebula
  10. Westerhout 40
Dark nebulae

This section contains 2 articles.

  1. Coalsack Nebula
  2. Horsehead Nebula (Level 4)
Planetary nebulae and supernova remnants

This section contains 8 articles.

  1. Cassiopeia A
  2. Cat's Eye Nebula
  3. Crab Nebula (Level 4)
  4. Cygnus Loop
  5. Dumbbell Nebula
  6. NGC 6302
  7. NGC 7027
  8. Ring Nebula (Level 4)

Star clusters

This section contains 12 articles.

Open clusters

This section contains 6 articles.

  1. Beehive Cluster
  2. Double Cluster
  3. Hyades (star cluster) (Level 4)
  4. Messier 7
  5. Pleiades (Level 4)
  6. Trapezium Cluster
Globular clusters

This section contains 6 articles.

  1. 47 Tucanae
  2. Messier 4
  3. Messier 13
  4. Messier 15
  5. Messier 22
  6. Omega Centauri (Level 4)

Transient events in the Milky Way galaxy

This section contains 4 articles.

  1. Kepler's Supernova
  2. SN 1006
  3. SN 1054
  4. SN 1572

Milky Way galaxy: general

This section contains 10 articles.

  1. Milky Way (Level 3)
  2. Galactic Center (Level 4)
    1. Sagittarius A
      1. Sagittarius A* (Level 4)
  3. Local Bubble
    1. Local Interstellar Cloud
    2. G-Cloud
  4. Orion Arm
  5. Perseus Arm
  6. Scutum–Centaurus Arm

Outside the Milky Way galaxy

This section contains 62 articles.

Galaxies

This section contains 35 articles.

Local Group

This section contains 9 articles.

  1. Andromeda Galaxy (Level 4)
  2. Triangulum Galaxy (Level 4)
Satellite galaxies of the Milky Way

This section contains 7 articles.

  1. Magellanic Clouds
    1. Large Magellanic Cloud (Level 4)
      1. Tarantula Nebula
      2. R136
    2. Small Magellanic Cloud (Level 4)
    3. Magellanic Stream
  2. Sagittarius Dwarf Spheroidal Galaxy
Other galaxies

This section contains 26 articles.

  1. 3C 273 (Level 4)
  2. Antennae Galaxies
  3. Arp 220
  4. BL Lacertae
  5. Cartwheel Galaxy
  6. Centaurus A (Level 4)
  7. Cygnus A
  8. Hoag's Object
  9. IC 1101
  10. Markarian 421
  11. Markarian 501
  12. Messier 49
  13. Messier 77
  14. Messier 81
  15. Messier 82
  16. Messier 83
  17. Messier 87 (Level 4)
  18. Messier 106
  19. NGC 1275
  20. NGC 4151
  21. NGC 5548
  22. NGC 6946
  23. Pinwheel Galaxy (Level 4)
  24. Sculptor Galaxy
  25. Sombrero Galaxy
  26. Whirlpool Galaxy (Level 4)

Galaxy clusters and larger structures

This section contains 19 articles.

Virgo Supercluster

This section contains 8 articles.

  1. Virgo Supercluster (Level 4)
  2. Local Group (Level 4)
    1. Satellite galaxies of the Milky Way
  3. Virgo Cluster (Level 4)
  4. Centaurus A/M83 Group
  5. IC 342/Maffei Group
  6. M81 Group
  7. Local Sheet
Other galaxy clusters and larger structures

This section contains 11 articles.

  1. Laniakea Supercluster
  2. Coma Cluster
  3. Fornax Cluster
  4. Perseus Cluster
  5. Great Attractor (Level 4)
  6. Bullet Cluster
  7. Shapley Supercluster
  8. Pisces–Cetus Supercluster Complex
  9. South Pole Wall
  10. Huge-LQG
  11. BOSS Great Wall

Cosmic voids

This section contains 5 articles.

  1. Local Hole
  2. Boötes Void
  3. Local Void
  4. Giant Void
  5. Dipole repeller

Transient events outside the Milky Way galaxy

This section contains 3 articles.

  1. SN 1972E
  2. SN 1987A
  3. GW170817

Notable patches of universe

This section contains 3 articles.

  1. Hubble Deep Field
  2. Hubble Ultra-Deep Field
  3. CMB cold spot

Celestial mechanics

This section contains 73 articles.

  1. Celestial mechanics (Level 4)
  2. Orbit (Level 4)
    1. Barycenter (astronomy) (Level 4)
    2. Tidal locking (Level 4)
    3. Orbital eccentricity
    4. Orbital elements
    5. Orbital inclination
    6. Orbital period
  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
  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

Times of the day

This section contains 19 articles.

  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. Belt of Venus
  17. Blue hour
  18. Golden hour (photography)
  19. Terminator (solar)

Orbital mechanics

This section contains 22 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. Geosynchronous orbit (Level 4)
    1. Geostationary orbit (Level 4)
  4. Molniya orbit
  5. Gravitational acceleration (Level 4)
  6. Gravity assist (Level 4)
    1. Oberth effect
  7. Low Earth orbit (Level 4)
    1. Frozen orbit
    2. Sun-synchronous orbit
    3. Polar orbit
  8. Halo orbit
  9. Lissajous orbit
  10. Co-orbital configuration
    1. Horseshoe orbit
  11. 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)
      1. Equinox (celestial coordinates)
      2. Right ascension
      3. Declination
    2. 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)

Constellations and asterisms

This section contains 92 articles.

Zodiac constellations

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 constellations

This section contains 78 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 (constellation)
  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)
    1. Orion's Belt
  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)
    1. Big Dipper
  73. Ursa Minor (Level 4)
  74. Vela (constellation)
  75. Volans
  76. Vulpecula

Obsolete constellations

This section contains 2 articles.

  1. Argo Navis
  2. Quadrans Muralis

Planetary science

For specific planets and minor planets, see Solar system and Notable exoplanets This section contains 52 articles.

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

Stellar astronomy

For specific stars, see Notable stars This section contains 118 articles.

  1. Star (Level 3)
  2. 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
  3. Star cluster (Level 4)
    1. Stellar association
    2. Open cluster
    3. Globular cluster
      1. Blue straggler
    4. Super star cluster
  4. 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
  5. Intergalactic star
  6. Stellar evolution (Level 4)
    1. Red-giant branch
    2. Helium flash
    3. Asymptotic giant branch
    4. Horizontal branch
  7. 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
  8. Stellar kinematics (Level 4)
  9. Stellar magnetic field (Level 4)
  10. Stellar nucleosynthesis
    1. Proton–proton chain
    2. CNO cycle
    3. Triple-alpha process
    4. Carbon-burning process
    5. s-process
    6. r-process
  11. Stellar structure (Level 4)
    1. Stellar core
    2. Radiative zone
    3. Convection zone
    4. Stellar atmosphere
  12. Stellar rotation
  13. Stellar mass
    1. Initial mass function
  14. Stellar wind
  15. Metallicity (Level 4)
    1. Chemically peculiar star
  16. Circumstellar disc
    1. Debris disk
    2. Protoplanetary disk
    3. Proplyd
  17. Brown dwarf (Level 4)
    1. Sub-brown dwarf
  18. Hertzsprung–Russell diagram (Level 4)
  19. Double star
  20. Protoplanetary nebula
  21. Planetary nebula (Level 4)
  22. 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
  23. Gamma-ray burst (Level 4)
    1. Gamma-ray burst emission mechanisms
    2. Gamma-ray burst progenitors
  24. Fast radio burst
  25. Kilonova
  26. Asteroseismology
  27. Mass–luminosity relation

Stellar classification

This section contains 18 articles.

  1. Stellar classification (Level 4)
  2. Main sequence (Level 4)
    1. Red dwarf
  3. Subdwarf
  4. Subgiant
  5. Giant star (Level 4)
    1. Blue giant
    2. Red giant (Level 4)
  6. Carbon star
  7. S-type star
  8. Supergiant (Level 4)
    1. Blue supergiant
    2. Yellow supergiant
    3. Red supergiant
  9. Hypergiant
  10. Wolf–Rayet star (Level 4)
  11. Be star
  12. B[e] star

Variable star

This section contains 13 articles.

  1. Variable star (Level 4)
  2. Cataclysmic variable star
    1. Nova (Level 4)
  3. Cepheid variable (Level 4)
    1. Classical Cepheid variable
    2. RR Lyrae variable
    3. Type II Cepheid
  4. Flare star
  5. Luminous blue variable
  6. Mira variable
  7. T Tauri star
  8. Herbig Ae/Be star
  9. Instability strip

Galactic and extragalactic astronomy

For specific galaxies, see Notable galaxies This section contains 91 articles.

Basics

This section contains 54 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 (Level 4)
    3. Intermediate-mass black hole
    4. Micro black hole
    5. Accretion disk
    6. 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. 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 nuclei

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 52 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. Structure formation
  4. Shape of the universe
  5. Ultimate fate of the universe (Level 4)
    1. Heat death of the universe
    2. Big Rip
    3. Big Crunch
    4. Cyclic model
  6. Cosmic microwave background (Level 4)
    1. Discovery of cosmic microwave background radiation
  7. Cosmic neutrino background
  8. Big Bang nucleosynthesis
    1. Alpher–Bethe–Gamow paper
    2. Missing baryon problem
  9. Baryogenesis
  10. Expansion of the universe
    1. Accelerating expansion of the universe
    2. Hubble's law (Level 4)
      1. Hubble volume
    3. Redshift (Level 4)
    4. Scale factor (cosmology)
  11. Baryon acoustic oscillations
  12. Primordial fluctuations
  13. Dark matter (Level 4)
  14. Dark energy (Level 4)
    1. Cosmological constant (Level 4)
    2. Lambda-CDM model
    3. Quintessence (physics)
  15. Comoving and proper distances
  16. Anthropic principle
  17. Flatness problem
  18. Horizon problem
  19. Steady-state model
  20. Multiverse

Chronology of the universe

This section contains 11 articles.

  1. Chronology of the universe (Level 4)
  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. Recombination (cosmology)
  9. Photon epoch
  10. Reionization

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