User:Rreagan007/sandbox2

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 are labelled as:


 * Featured articles
 * Former featured articles
 * A-class articles
 * Good articles
 * Delisted good articles
 * B-class articles
 * C-class articles
 * Start-class articles
 * Stub-class articles
 * A full list is at Template:Icon/doc

These symbols are updated manually and may be out of date; you are encouraged to fix any errors you discover.

Total articles: 188

For astronomical instruments, see the Optical Technology (Level 4) section

=Astronomy basics (8 articles)=


 * 1)  Astronomy (Level 2)
 * 2)  Astrophysics (Level 4)
 * 3)  Astrobiology (Level 4)
 * 4)   Extraterrestrial life (Level 4)

Observational astronomy (4 articles)
 * 1)  Observatory (Level 4)
 * 2)  Luminosity (Level 4)
 * 3)  Magnitude (Level 4)
 * 4)  Extinction (Level 4)

=Astronomical objects (62 articles)=
 * 1)  Astronomical object (Level 4)

Solar System (25 articles)

 * 1)  Solar System (Level 3)
 * 2)  Sun (Level 3)
 * 3)  Mercury (Level 3)
 * 4)  Venus (Level 3)
 * 5)  Earth (Level 1)
 * 6)  Moon (Level 3)
 * 7)  Mars (Level 3)
 * 8)  Asteroid belt (Level 4)
 * 9)  Ceres (Level 4)
 * 10)  Jupiter (Level 3)
 * 11)  Io (Level 4)
 * 12)  Europa (Level 4)
 * 13)  Ganymede (Level 4)
 * 14)  Callisto (Level 4)
 * 15)  Saturn (Level 3)
 * 16)  Enceladus (Level 4)
 * 17)  Titan (Level 4)
 * 18)  Uranus (Level 3)
 * 19)  Neptune (Level 3)
 * 20)  Triton (Level 4)
 * 21)  Kuiper belt (Level 4)
 * 22)  Pluto (Level 4)
 * 23)  Eris (Level 4)
 * 24)  Oort cloud (Level 4)
 * 25)  Interplanetary medium (Level 4)

Notable stars (10 articles)

 * 1)  Alpha Centauri (Level 4)
 * 2)  Arcturus (Level 4)
 * 3)  Betelgeuse (Level 4)
 * 4)  Canopus (Level 4)
 * 5)  Capella (Level 4)
 * 6)  Polaris (Level 4)
 * 7)  Procyon (Level 4)
 * 8)  Rigel (Level 4)
 * 9)  Sirius (Level 4)
 * 10)  Vega (Level 4)

Notable galaxies (12 articles)

 * 1)  Local Group (Level 4)
 * 2)  Milky Way (Level 3)
 * 3)  Galactic Center (Level 4)
 * 4)  Sagittarius A* (Level 4)
 * 5)  Andromeda Galaxy (Level 4)
 * 6)  Large Magellanic Cloud (Level 4)
 * 7)  Small Magellanic Cloud (Level 4)
 * 8)  Triangulum Galaxy (Level 4)
 * 9)  Centaurus A (Level 4)
 * 10)  Messier 87 (Level 4)
 * 11)  Pinwheel Galaxy (Level 4)
 * 12)  Whirlpool Galaxy (Level 4)

Notable nebulae (6 articles)

 * 1)  Carina Nebula (Level 4)
 * 2)   Crab Nebula (Level 4)
 * 3)  Eagle Nebula (Level 4)
 * 4)  Horsehead Nebula (Level 4)
 * 5)  Orion Nebula (Level 4)
 * 6)  Ring Nebula (Level 4)

Other notable objects (8 articles)

 * 1)  3C 273 (Level 4)
 * 2)  Cygnus X-1 (Level 4)
 * 3)  Halley's Comet (Level 4)
 * 4)  Hyades (Level 4)
 * 5)  Omega Centauri (Level 4)
 * 6)  Pleiades (Level 4)
 * 7)  Virgo Supercluster (Level 4)
 * 8)  Virgo Cluster (Level 4)

=Celestial mechanics and astrometry (31 articles)=

Celestial mechanics (10 articles)

 * 1)  Celestial mechanics (Level 4)
 * 2)  Natural satellite (Level 3)
 * 3)  Orbit (Level 3)
 * 4) Barycenter (Level 4)
 * 5) Tidal locking (Level 4)
 * 6)  Eclipse (Level 4)
 * 7)  Lunar eclipse (Level 4)
 * 8)  Solar eclipse (Level 4)
 * 9)  Kepler's laws of planetary motion (Level 4)
 * 10)  Lagrangian point (Level 4)

Celestial sphere (8 articles)

 * 1)  Celestial sphere (Level 4)
 * 2)  Celestial coordinate system (Level 4)
 * 3)  Equatorial coordinate system (Level 4)
 * 4)  Equinox (Level 4)
 * 5)  Ecliptic (Level 4)
 * 6)  Horizon (Level 4)
 * 7)  Solstice (Level 4)
 * 8)  Zodiac (Level 4)

Constellations (8 articles)

 * 1)  Constellation (Level 4)
 * 2)  Canis Major (Level 4)
 * 3)  Cassiopeia (Level 4)
 * 4)  Centaurus (Level 4)
 * 5)  Crux (Level 4)
 * 6)  Orion (Level 4)
 * 7)  Ursa Major (Level 4)
 * 8)  Ursa Minor (Level 4)

Astrometry (5 articles)

 * 1)  Astrometry (Level 4)
 * 2)  Albedo (Level 4)
 * 3)  Cosmic distance ladder (Level 4)
 * 4)  Parallax (Level 4)
 * 5)  Photometry (Level 4)

=Galactic astronomy and extragalactic astronomy (28 articles)=

Basics (15 articles)

 * 1)  Outer space (Level 3)
 * 2)  Galaxy (Level 3)
 * 3)   Black hole (Level 3)
 * 4)  Schwarzschild radius (Level 4)
 * 5)  Supermassive black hole (Level 4)
 * 6)  Galaxy groups and clusters (Level 4)
 * 7)  Supercluster (Level 4)
 * 8)  Interstellar medium (Level 4)
 * 9)  Nebula (Level 4)
 * 10)  Dark nebula (Level 4)
 * 11)  Molecular cloud (Level 4)
 * 12)  Great Attractor (Level 4)
 * 13)  H II region (Level 4)
 * 14)  Void (astronomy) (Level 4)
 * 15)  Cosmic ray (Level 4)

Galaxy morphological classification (7 articles)

 * 1)  Galaxy morphological classification (Level 4)
 * 2)  Spiral galaxy (Level 4)
 * 3)  Barred spiral galaxy (Level 4)
 * 4)  Elliptical galaxy (Level 4)
 * 5)  Lenticular galaxy (Level 4)
 * 6)  Irregular galaxy (Level 4)
 * 7)  Dwarf galaxy (Level 4)

Active galactic nucleus (6 articles)

 * 1)  Active galactic nucleus (Level 4)
 * 2)  Radio galaxy (Level 4)
 * 3)  Seyfert galaxy (Level 4)
 * 4)  Starburst galaxy (Level 4)
 * 5)  Blazar (Level 4)
 * 6)  Quasar (Level 4)

=Physical cosmology (16 articles)=


 * 1)  Physical cosmology (Level 3)
 * 2)  Universe (Level 2)
 * 3)  Observable universe (Level 4)
 * 4)  Chronology of the universe (Level 4)
 * 5)  Ultimate fate of the universe (Level 4)
 * 6)  Big Bang (Level 3)
 * 7)   Inflation (cosmology) (Level 4)
 * 8)   Cosmic microwave background (Level 4)
 * 9)  Galaxy formation and evolution (Level 4)
 * 10)  Formation and evolution of the Solar System (Level 4)
 * 11)  Nebular hypothesis (Level 4)
 * 12)   Dark matter (Level 4)
 * 13)  Dark energy (Level 4)
 * 14)  Cosmological constant (Level 4)
 * 15)  Redshift (Level 4)
 * 16)   Hubble's law (Level 4)

=Planetary science (12 articles)=


 * 1)  Planet (Level 3)
 * 2)  Terrestrial planet (Level 4)
 * 3)  Giant planet (Level 4)
 * 4)   Exoplanet (Level 4)
 * 5)  Atmosphere (Level 4)
 * 6)  Ring system (Level 4)
 * 7)  Minor planet (Level 4)
 * 8)   Asteroid (Level 3)
 * 9)  Dwarf planet (Level 4)
 * 10)   Comet (Level 3)
 * 11)  Meteor shower (Level 4)
 * 12)  Impact event (Level 4)

=Stellar astronomy (31 articles)=


 * 1)  Star (Level 3)
 * 2)  Variable star (Level 4)
 * 3)  Supernova (Level 3)
 * 4)  Gamma-ray burst (Level 4)
 * 5)  Nova (Level 4)
 * 6)  Pulsar (Level 4)
 * 7)  Cepheid variable (Level 4)
 * 8)  Star system (Level 4)
 * 9)  Planetary system (Level 4)
 * 10)   Binary star (Level 4)
 * 11)  Star cluster (Level 4)
 * 12)  Stellar classification (Level 4)
 * 13)  Stellar evolution (Level 4)
 * 14)  Star formation (Level 4)
 * 15)   Planetary nebula (Level 4)
 * 16)  Protostar (Level 4)
 * 17)  Main sequence (Level 4)
 * 18)  Giant star (Level 4)
 * 19)  Red giant (Level 4)
 * 20)  Supergiant star (Level 4)
 * 21)  Wolf–Rayet star (Level 4)
 * 22)  White dwarf (Level 4)
 * 23)  Neutron star (Level 4)
 * 24)  Stellar kinematics (Level 4)
 * 25)  Stellar magnetic field (Level 4)
 * 26)  Stellar nucleosynthesis (Level 4)
 * 27)  Stellar structure (Level 4)
 * 28)  Solar wind (Level 4)
 * 29)  Metallicity (Level 4)
 * 30)  Brown dwarf (Level 4)
 * 31)  Hertzsprung–Russell diagram (Level 4)