5

53 Persei stars

A

A dwarf stars
A giant stars
A stars
A subdwarf stars
A subgiant stars
A supergiant stars
Abell clusters
Absolute magnitude
Abundance ratio
Accelerating universe
Accreting binary stars
Accretion
Achondrites
Active galactic nuclei
Active galaxies
Active sun
Adaptive interferometry
Ae stars
Aerolites
Aeronomy
Alfven waves
Algol variable stars
All-sky cameras
Almanacs
Alpha2 Canum Venaticorum stars
Alt-azimuth mounts
Alternatives to cosmic inflation
Altitude angle
AM Canum Venaticorum stars
AM Herculis stars
Am stars
Amateur astronomers
Amateur astronomy
Amor group
Amorphous irregular galaxies
Analytical mathematics
Andromeda Galaxy
Angular separation
Annual equation
Annual parallax
Annular eclipses
Anomalistic month
Ansae
Antapex
Antarctic observatories
Anthropic principle
Antumbra
Ap stars
Apastron
Aperiodic comets
Aperture synthesis
Apex
Aphelion
Apocenter
Apogee
Apollo group
Apparent magnitude
Apparent position
Apparent superluminal motion
Apsidal motion
Apsis
Archaeoastronomy
Argument of perigee
Argument of perihelion
Armillary spheres
Artificial satellites
Ascending node
Asteroid belt
Asteroid occultation
Asteroids
Asteroseismology
Astrobiology
Astrochemistry
Astrodynamics
Astrographic catalogs
Astroinformatics
Astrometric binary stars
Astrometry
Astronomers
Astronomical coordinate systems
Astronomical databases
Astronomical detectors
Astronomical location
Astronomical models
Astronomical object identification
Astronomical optics
Astronomical radiation sources
Astronomical reference materials
Astronomical research
Astronomical seeing
Astronomical sextants
Astronomical site protection
Astronomical unit
Astroparticle physics
Astrophotography
Astrophysical black holes
Astrophysical dust processes
Astrophysical explosive burning
Astrophysical fluid dynamics
Astrophysical magnetism
Astrophysical masers
Astrophysical processes
Astrophysicists
Astrosphere interstellar medium interactions
Astrospheres
Asymptotic giant branch
Ataxites
Aten group
Atira group
Atmospheric circulation
Atmospheric effects
Atmospheric extinction
Atmospheric refraction
Atmospheric science
Atmospheric scintillation
Atmospheric tides
Atom interferometry
Australites
Automated telescopes
Automatic patrol telescopes
Autumnal equinox
Azimuth

B

B dwarf stars
B giant stars
B stars
B subdwarf stars
B subgiant stars
B supergiant stars
Baade-Wesselink method
Bailey type stars
Baily's beads
Baker-Nunn cameras
Barium stars
Barred spiral galaxies
Baryogenesis
Baryon acoustic oscillations
Baryon density
Baryonic dark matter
Bautz-Morgan type
Be stars
Be type stars
Bediasites
Bekenstein–Hawking entropy
Beryllium abundance
Bessel photometry
Beta Cephei stars
Beta Lyrae stars
Bianchi cosmology
Big Bang nucleosynthesis
Big Bang theory
Binary pulsars
Binary stars
Bipolar nebulae
Bipolar sunspot groups
BL Herculis stars
BL Lacertae objects
Black hole physics
Black hole spin-flip
Black hole thermodynamics
Black holes
Blank field
Blazars
Blue cloud galaxies
Blue compact dwarf galaxies
Blue loop
Blue straggler stars
Blueshifted
Bode's law
Bok globules
Bolides
Bolometric correction
Bondi accretion
Borasisi
Boron abundance
Bouwers telescope
Bp stars
Brane cosmology
Bright nebulae
Brightest cluster galaxies
Brightness temperature
Broad band photometry
Broad-absorption line quasar
Brown dwarf stars
Burkert profile
Burst astrophysics
BV photometry
BW stars
BY Draconis stars

C

Calendars
Cape photometry
Cape RI photometry
Carbon burning
Carbon dioxide
Carbon flashes
Carbon planets
Carbon stars
Carbon-nitrogen cycle
Carbonaceous chondrites
Carbonaceous grains
Cassegrain telescopes
Cataclysmic variable stars
Catadioptric telescopes
Catalogs
Caustic crossing
CCD observation
CCD photometry
cD galaxies
Celestial equator
Celestial mechanics
Celestial objects catalogs
Celestial poles
Celestial sphere
Centaurs
Center of mass
Cepheid distance
Cepheid variable stars
Ceres
CH stars
Chandrasekhar limit
Chaos
Charged black holes
Chemical abundances
Chemical enrichment
Chemically peculiar stars
Chlorofluorocarbons
Chondrites
Chondrules
Chromospheres
Chthonian planets
CII region
Circular orbit
Circumstellar clouds
Circumstellar disks
Circumstellar dust
Circumstellar envelopes
Circumstellar gas
Circumstellar grains
Circumstellar masers
Circumstellar matter
Circumstellar shells
Cirrus castellanus
Cirrus fibratus
Cirrus floccus
Cirrus spissatus
Cirrus uncinus
Cirrus vertebratus
Classical black holes
Classical Kuiper belt objects
Classical novae
Classical T Tauri stars
Classification systems
Close binary stars
Close encounters
Closed universe
Cloud monitors
Clouds
CMBR detectors
CN stars
CNO anomaly
CO line emission
Cocoon stars
Coelostats
Cold dark matter
Cold neutral medium
Collapsing clouds
Collimation
Color equations
Coma Cluster
Comas
Comet interiors
Comet tail streamers
Comet tails
Cometary atmospheres
Cometary globules
Cometary ionospheres
Cometary nebulae
Cometary studies
Comets
Compact binary components
Compact binary stars
Compact binary systems
Compact dwarf galaxies
Compact galaxies
Compact H II region
Compact nebulae
Compact objects
Compact radiation sources
Companion galaxies
Companion stars
Comparison stars
Computational astronomy
Conical singularities
Conjunction
Constellations
Contact binary stars
Continuum radio emission
Convective envelopes
Convective shells
Convective zones
Cool cores
Cool intergalactic medium
Core-collapse supernovae
Coronae
Coronal dimming
Coronal hole
Coronal lines
Coronal loops
Coronal mass ejections
Coronal plumes
Coronal transients
Coronographic imaging
Corotating streams
Cosmic abundance
Cosmic anisotropy
Cosmic background radiation
Cosmic electrodynamics
Cosmic inflation
Cosmic isotropy
Cosmic magnetic fields theory
Cosmic microwave background radiation
Cosmic noise
Cosmic ray astronomy
Cosmic ray detectors
Cosmic ray nucleosynthesis
Cosmic ray showers
Cosmic ray sources
Cosmic rays
Cosmic web
Cosmochemistry
Cosmochronology
Cosmogony
Cosmological constant
Cosmological constant experiments
Cosmological evolution
Cosmological models
Cosmological neutrinos
Cosmological parameters
Cosmological parameters from large-scale structure
Cosmological perturbation theory
Cosmological phase transitions
Cosmology
Curvature singularities
Curved space

D

D galaxies
D layer
DA stars
Damped Lyman-alpha systems
Dark adaption
Dark energy
Dark interstellar clouds
Dark matter
Dark matter density
Dark matter detectors
Dark matter distribution
Darkrooms
DB stars
DC stars
DDO classification
DDO photometry
de Sitter universe
De Vaucouleurs Sandage classification
Debris disks
Deceleration parameter
Declination
Deep space probes
Degenerate matter
Delta cephei
Delta Delphini stars
Delta Scuti variable stars
Dense interstellar clouds
Density parameters
Density wave model
Descending node
Detached binary stars
Detached objects
Deucalion
Diamond ring effect
Diffuse interstellar bands
Diffuse interstellar clouds
Diffuse molecular clouds
Diffuse nebulae
Diffuse radiation
Diffuse x-ray background
Dirac cosmology
Direct detection interferometry
Direct imaging [Exoplanets]
Dirty snowball theory
Discrete radio sources
Disk flaring
Disk galaxies
Disk population
Disk stars
Distance indicators
Distance measure
Diurnal parallax
DO stars
Dobsonian telescopes
Domes
Doppler imaging
Doppler shift
Double galaxies
Double quasars
Double-mode Cepheid variable stars
Double-mode pulsation
Double-mode variable stars
DQ Herculis stars
DQ stars
Draco dwarf galaxy
Dredge-up
Drift scan imaging
Dumbbell galaxies
Dust continuum emission
Dust nebulae
Dust shells
Dwarf elliptical galaxies
Dwarf galaxies
Dwarf irregular galaxies
Dwarf novae
Dwarf planets
Dwarf spheroidal galaxies
Dynamical evolution
Dynamical friction
Dynamical parallax
DZ stars

E

E corona
E layer
E+A galaxies
E-folding time
Early astronomical instruments
Early stellar evolution
Early universe
Early-type emission stars
Early-type galaxies
Early-type stars
Early-type supergiant stars
Early-type variable stars
Earth (planet)
Earth atmosphere
Earth trojans
Earth-moon system
Eccentric anomaly
Eccentricity
Eclipses
Eclipsing binary minima timing method
Eclipsing binary stars
Ecliptic coordinate system
Ecliptic latitude
Ecliptic longitude
Ecliptic poles
Effective temperature
Einstein field equations
Einstein rings
Einstein universe
Ejecta
Elemental abundance
Ellipsoidal variable stars
Elliptical galaxies
Elliptical orbit
Emerging flux tubes
Emission line galaxies
Emission line stars
Emission nebulae
English mounts
Ephemeral active regions
Ephemerides
Equation of the center
Equator position
Equatorial coordinate system
Equatorial mounts
Equatorial zone
Equinox
Equinox correction
Ergosphere
Eris
Eruptive binary stars
Eruptive phenomena
Eruptive variable stars
Ethnoastronomy
Evaporating gaseous globules
Event horizons
Evolution equation
Evolved stars
Exobiology
Exomoons
Exoplanet astrometry
Exoplanet astronomy
Exoplanet atmospheres
Exoplanet catalogs
Exoplanet detection methods
Exoplanet dynamics
Exoplanet evolution
Exoplanet formation
Exoplanet plate tectonics
Exoplanet rings
Exoplanet structure
Exoplanet surface characteristics
Exoplanet systems
Exoplanet tides
Exoplanets
Exosphere
Exozodiacal dust
Expanding stellar envelopes
Expanding universe
Explosive nucleosynthesis
Extended radiation sources
Extinction
Extragalactic astronomy
Extragalactic magnetic fields
Extragalactic radio sources
Extrasolar gas giants
Extrasolar radiation
Extrasolar rocky planets
Extreme carbon stars
Extreme horizontal branch stars
Extrinsic variable stars

F

F corona
F dwarf stars
F giant stars
F layer
F stars
F subdwarf stars
F subgiant stars
F supergiant stars
Faber-Jackson distance
Fabry-Perot interferometers
Faint blue stars
Fanaroff-Riley radio galaxies
Far infrared astronomy
Far-infrared interferometry [Exoplanets]
Fast novae
Few-body systems
Fibrils
Field galaxies
Field of view
Filamentary nebulae
Finding charts
Finding lists
Fireballs
FK catalog
Flare stars
Flash spectra
Flash stars
Flat space
Flux calibration
Flyby missions
Forbush effect
Fork mounts
Fornax dwarf spheroidal galaxy
Free floating planets
Friedmann universe
Friedmann-Robertson-Walker metric
Frozen in elements
FU Orionis stars
Fundamental parameters of stars

G

G dwarf stars
G giant stars
G stars
G subdwarf stars
G subgiant stars
G supergiant stars
Galactic accretion disks
Galactic and extragalactic astronomy
Galactic anticenter
Galactic center
Galactic coordinate system
Galactic cosmic rays
Galactic latitude
Galactic longitude
Galactic poles
Galactic radio sources
Galactic winds
Galaxies
Galaxy abundances
Galaxy accretion
Galaxy ages
Galaxy anticenters
Galaxy bulges
Galaxy chemical composition
Galaxy chemical evolution
Galaxy circumnuclear disk
Galaxy classification systems
Galaxy cluster counts
Galaxy clusters
Galaxy collisions
Galaxy colors
Galaxy components
Galaxy counts
Galaxy disks
Galaxy distances
Galaxy dynamics
Galaxy encounters
Galaxy equators
Galaxy evolution
Galaxy formation
Galaxy fountains
Galaxy groups
Galaxy halos
Galaxy infall
Galaxy interactions
Galaxy jets
Galaxy kinematics
Galaxy luminosities
Galaxy magnetic fields
Galaxy magnitudes
Galaxy mass distribution
Galaxy masses
Galaxy mergers
Galaxy nuclei
Galaxy pairs
Galaxy photometry
Galaxy physics
Galaxy planes
Galaxy processes
Galaxy properties
Galaxy radial velocities
Galaxy radii
Galaxy rotation
Galaxy rotation curves
Galaxy spurs
Galaxy stellar content
Galaxy structure
Galaxy tides
Galaxy triplets
Galaxy voids
Galaxy winds
Galilean satellites
Gamma Cassiopeiae stars
Gamma ray telescopes
Gamma rays
Gamma-ray astronomy
Gamma-ray bursts
Gamma-ray detectors
Gamma-ray lines
Gamma-ray observatories
Gamma-ray sources
Gamma-ray telescopes
Gas-to-dust ratio
Gaseous nebulae
Gegenschein
General relativity
Geneva photometry
Geocentric orbit
Geocorona
Geodesics
Geomagnetic fields
Geostationary satellites
Geosynchronous satellites
German equatorial mounts
Giant branches
Giant elliptical galaxies
Giant galaxies
Giant molecular clouds
Giant radio galaxies
Giant stars
Globular star clusters
Gould Belt
Granule
Gravastars
Gravitation
Gravitational collapse
Gravitational deflection
Gravitational disruption
Gravitational energy
Gravitational equilibrium
Gravitational fields
Gravitational instability
Gravitational interaction
Gravitational lensing
Gravitational lensing shear
Gravitational microlensing
Gravitational microlensing [Exoplanets]
Gravitational singularities
Gravitational wave astronomy
Gravitational wave detectors
Gravitational wave sources
Gravitational waves
Gravity anomaly
Gravity darkening
Grazing incidence telescopes
Great Attractor
Green valley galaxies
Greenhouse gases
Gregorian telescopes
Ground telescopes
Ground-based astronomy
Gunn photometry
Gödel universe

H

H alpha photometry
H beta photometry
H I regions
H II regions
H-alpha stars
H1 line emission
Habitable planets
Habitable zone
Hadron barrier
Hall thrusters
Halo stars
Hardness ratio
Haro galaxies
Haumea
Hawking radiation
Hayashi track
Heavy metal stars
Heliocentric orbit
Heliopause
Helioseismic pulsations
Helioseismology
Heliosheath
Heliosphere
Heliostats
Helium abundance
Helium burning
Helium weak stars
Helium-poor stars
Helium-rich stars
Helmholtz-Kelvin contraction
Henry Draper catalog
Henry Draper Catalogue
Henyey track
Herbig Ae/Be stars
Herbig-Haro objects
Hertzsprung gap
Hertzsprung Russell diagrams
Heterodyne interferometry
Heterodyne receivers
HI shells
Hickson compact group
Hierarchical cosmology
High altitude balloons
High energy astrophysics
High latitude field
High time resolution astrophysics
High-energy cosmic radiation
High-mass stars
High-mass X-ray binary stars
High-redshift galaxies
High-velocity clouds
High-velocity stars
Hilda group
Hirayama families
Holmberg radius
Holmium stars
Holographic interferometry
Horizontal branch stars
Horizontal coordinate system
Horizontal parallax
Horseshoe mounts
Hot dark matter
Hot intergalactic medium
Hot ionized medium
Hot Jupiters
Hot Neptunes
Hour angle
HST photometry
Hubble classification scheme
Hubble constant
Hubble diagram
Hubble radius
Hubble Space Telescope
Hubble time
Hubble's law
Humidity
Hungaria group
Huya
Hydrodynamical simulations
Hydrogen burning
Hydrogen deficient stars
Hydrosphere
Hydroxyl masers
Hydroxyl sources
Hyperbolic orbit
Hypergiant stars
Hypernovae
Hypervelocity stars
Hz Herculis stars

I

I galaxies
Impact phenomena
Inclination
Individual planetary nebulae
Individual quasars
Indochinites
Inflationary universe
Infrared Astronomical Satellite
Infrared astronomy
Infrared dark clouds
Infrared excess
Infrared excess galaxies
Infrared galaxies
Infrared observatories
Infrared photometry
Infrared sources
Infrared telescopes
Initial conditions of the universe
Initial mass function
Inner planets
Instability strip
Instrumentation
Integrated magnitude
Interacting binary stars
Interacting galaxies
Intercloud medium
Interdisciplinary astronomy
Interferometers
Interferometric binary stars
Interferometric correlation
Interferometry
Intergalactic clouds
Intergalactic dust clouds
Intergalactic filaments
Intergalactic gas
Intergalactic medium
Intergalactic medium phases
Intergalactic voids
Intermediate population stars
Intermediate type stars
Intermediate-mass black holes
Internal waves
Interplanetary discontinuities
Interplanetary dust
Interplanetary gas
Interplanetary grains
Interplanetary magnetic fields
Interplanetary medium
Interplanetary particle acceleration
Interplanetary physics
Interplanetary scintillation
Interplanetary shocks
Interplanetary turbulence
Interstellar absorption
Interstellar abundances
Interstellar atomic gas
Interstellar clouds
Interstellar cyclotron emission
Interstellar dust
Interstellar dust extinction
Interstellar dust processes
Interstellar dynamics
Interstellar emissions
Interstellar extinction
Interstellar filaments
Interstellar line absorption
Interstellar line emission
Interstellar magnetic fields
Interstellar masers
Interstellar medium
Interstellar medium wind
Interstellar molecules
Interstellar phases
Interstellar plasma
Interstellar radiation field
Interstellar reddening
Interstellar scattering
Interstellar scintillation
Interstellar synchrotron emission
Interstellar thermal emission
Intracluster medium
Intrinsic variable stars
Ionosphere
Ionospheric scintillation
IRAS galaxies
Iron meteorites
Irregular galaxies
Irregular variable stars
Isothermal sphere profile
Isotopic abundance
Ixion

J

Jeans mass
Jets
Johnson photometry
Jovian satellites
Jupiter
Jupiter trojans

K

K corona
K dwarf stars
K giant stars
K stars
K subdwarf stars
K subgiant stars
K supergiant stars
Kappa mechanism
Kapteyn Selected Areas
Keplerian orbit
Kerr black holes
Kerr metric
Kerr-Newman black holes
Kinematic parallax
Kirkwood gap
Kreutz Sungrazers
Kron-Cousins photometry
Kruskal diagram
Kuiper belt

L

L dwarf stars
L galaxies
L subdwarf stars
Lagrangian points
Lambda density
Lambda Eridani stars
Land-atmosphere interactions
Landers
Large Magellanic Cloud
Large-scale structure of the universe
Laser guide stars
Laser interferometry
Late stellar evolution
Late-type dwarf stars
Late-type galaxies
Late-type giant stars
Late-type stars
Late-type supergiant stars
LB variable stars
LC variable stars
Lemaitre universe
Lenticular galaxies
Leptogenesis
Libration
Light curves
Light year
LIGO
Limb brightening
Limb darkening
Limiting magnitude
Line of sight
LINER galaxies
Lithium abundance
Lithium stars
Lithosphere
Local Group
Logos
Long baseline interferometers
Long baseline interferometry
Long period comets
Long period variable stars
Longitude of the ascending node
Longitude of the descending node
Low surface brightness galaxies
Low-density fields
Low-mass X-ray binary stars
Luminosity classification
Luminosity function
Luminous arcs
Luminous blue variable stars
Luminous infrared galaxies
Lunar atmosphere
Lunar composition
Lunar craters
Lunar domes
Lunar eclipses
Lunar evolution
Lunar features
Lunar geochronology
Lunar geodesy
Lunar gravitational field
Lunar highlands
Lunar impacts
Lunar interior
Lunar magnetic fields
Lunar maria
Lunar mineralogy
Lunar mountains
Lunar node regression
Lunar occultation
Lunar origin
Lunar petrology
Lunar phase
Lunar probes
Lunar rays
Lunar rilles
Lunar science
Lunar seismology
Lunar surface
Lunar theory
Lunar transient phenomena
Lyman alpha forest
Lyman limit systems
Lyman-alpha forest clouds
Lyman-alpha galaxies
Lyman-break galaxies

M

M dwarf stars
M giant stars
M region
M stars
M subdwarf stars
M subgiant stars
M supergiant stars
Mach-Zehnder interferometers
Magellanic Clouds
Magellanic Stream
Magnetars
Magnetic anomalies
Magnetic fields
Magnetic stars
Magnetic variable stars
Magnetosphere
Magnetospheric radio emissions [Exoplanets]
Magnitude
Main sequence stars
Major axis
Makemake
Maksutov telescopes
Manganese stars
Mantle
Markarian galaxies
Mars
Mars trojans
Martian satellites
Mascon
Mass ratio
Mass spectrometers
Mass-to-light ratio
Matter density
Maunder minimum
Maximal Kerr black holes
Me stars
Me variable stars
Mean anomaly
Mean matter density
Medium band photometry
Megalithic astronomy
Megamasers
Mercury
Mercury-manganese stars
Meridian
Meridian circles
Mesogranulation
Mesopause
Mesosphere
Metal abundance
Metal line absorbers
Meteor radiants
Meteor showers
Meteor streams
Meteor trails
Meteorite composition
Meteorites
Meteoroid dust clouds
Meteoroids
Meteors
Methane
Methods
Michelson interferometers
Michelson interferometry
Microgravity
Micrometeorites
Micrometeoroids
Milk Way dark matter halo
Milky Way disk
Milky Way dynamics
Milky Way evolution
Milky Way formation
Milky Way Galaxy
Milky Way Galaxy fountains
Milky Way Galaxy physics
Milky Way magnetic fields
Milky Way mass
Milky Way rotation
Milky Way stellar halo
Millimeter astronomy
Millisecond pulsars
Mini Neptunes
Minor axis
Minor planets
Mira variable stars
Missing mass
Modified Newtonian dynamics
Moldavites
Molecular astrophysics
Molecular clouds
Molecular gas
Mottles
Moving cluster parallax
Moving clusters
Multi-color photometry
Multi-periodic pulsation
Multi-periodic variable stars
Multiple mirror telescope
Multiple stars

N

N galaxies
N stars
N-body problem
N-body simulations
Nadir
Naked singularities
Narrow band photometry
Natural satellites
Nautical almanacs
Navarro-Frenk-White profile
Near infrared astronomy
Near ultraviolet astronomy
Near-Earth objects
Nebulae
Neptune
Neptune trojans
Neptunian satellites
Neutral hydrogen clouds
Neutrino astronomy
Neutrino decoupling
Neutrino masses
Neutrino oscillations
Neutrino telescopes
Neutron interferometry
Neutron star cores
Neutron stars
Newtonian cosmology
Newtonian gravitation
Newtonian telescopes
Night sky brightness
Night vision
Nitrous oxide
Noctilucent clouds
Non-Gaussianity
Non-radial pulsations
Non-standard theories of gravity
Non-thermal radiation sources
Nonclassical interferometry
Nonrotating black holes
Nonstandard evolution
North celestial pole
North ecliptic pole
North galactic pole
Nova-like variable stars
Novae
Nuclear abundances
Nuclear astrophysics
Nucleated dwarf galaxies
Nucleosynthesis

O

O associations
O clusters
O dwarf stars
O giant stars
O stars
O subdwarf stars
O subgiant stars
O supergiant stars
OB associations
OB stars
OB supergiant stars
Oblateness
Oblique rotators
Observational astronomy
Observational cosmology
Observatories
Occultation
Occulting disks
Ocean planets
Ocean tides
Ocean-atmosphere interactions
Oe stars
Oef stars
Of stars
OH/IR stars
Oort cloud
Oort cloud objects
Oort constants
Open star clusters
Open universe
Opik theory
Opposition
Optical bursts
Optical doubles
Optical flares
Optical identification
Optical interferometry
Optical observation
Optical observatories
Optical phase shifting interferometry
Optical position
Optical pulsars
Optical telescopes
Orbit determination
Orbital anomalies
Orbital elements
Orbital evolution
Orbital motion
Orbital nodes
Orbital resonances
Orbital theory
Orbiters
Orbits
Orcus
Origin of the universe
Orreries
Oscillating universe
Osculating orbit
Osculatory elements
Outer planets
Overabundance
Oxygen burning
Ozone layer

P

P-process
Parabolic orbit
Parallax
Parallel field
Parsec
Partial eclipses
Peculiar giants
Peculiar variable stars
Penrose limit
Penrose process
Penumbra
Penumbral filaments
Periapsis
Periastron
Perigee
Perihelion
Period determination
Periodic orbit
Periodic variable stars
Perseus Cluster
Perturbation methods
PG 1159 stars
Phase angle
Phase defect
Phase effect
Phase error
Phase switching
Philosophy of astronomy
Photodissociation regions
Photoelectric magnitude
Photoelectric photometry
Photogrammetry
Photographic astrometry
Photographic magnitude
Photographic photometry
Photoheliographs
Photometric parallax
Photometric standard stars
Photometric systems
Photometry
Photon decoupling
Photon sphere
Photospheres
Photovisual magnitude
Pickup ions
Plages
Planet formation
Planet hosting stars
Planetary alignment
Planetary atmospheres
Planetary boundary layers
Planetary bow shocks
Planetary cores
Planetary interior
Planetary nebulae
Planetary nebulae nuclei
Planetary polar regions
Planetary probes
Planetary ring divisions
Planetary rings
Planetary science
Planetary structure
Planetary system formation
Planetary theory
Planetesimals
Planets [Solar system]
Plasma astrophysics
Plasma clouds
Plasma jets
Plasmapause
Plate tectonics
Plutinos
Pluto
Plutoids
Pogson scale
Point sources
Pointing accuracy
Pointing error
Polar caps
Polar jets
Polar orbit
Polar tides
Polarimeters
Polarimetry
Polarimetry [Exoplanets]
Polycyclic aromatic hydrocarbons
Polytropes
Population I stars
Population II Cepheid stars
Population II stars
Population III stars
Position angle
Post-asymptotic giant branch
pp waves
Pre-main sequence evolution
Pre-main sequence stars
Pre-solar nebulae
Primordial black holes
Primordial galaxies
Primordial magnetic fields
Proper motions
Proplyds
Protoclusters
Protogalaxies
Proton-proton reaction
Protoplanetary disks
Protoplanetary nebulae
Protostars
Ptolemy stones
Pulsar planets
Pulsar timing method
Pulsars
Pulsating variable stars
Pulsation frequency method
Pulsation modes
Purkinje effect
PV Telescopii variable stars

Q

Quadrants
Quantum cosmology
Quantum gravity
Quaoar
Quasar absorption line spectroscopy
Quasar microlensing
Quasar-galaxy pairs
Quasars
Quasinormal modes
Quiescent prominence
Quiet sun
Quintessence

R

R associations
R Coronae Borealis variable stars
R stars
R-process
Radar astronomy
Radar telescopes
Radial pulsations
Radial velocity
Radial velocity methods [Exoplanets]
Radiative braking
Radiative transfer
Radiative transfer equation
Radio astrometry
Radio astronomy
Radio bursts
Radio continuum emission
Radio cores
Radio flares
Radio galaxies
Radio hot spots
Radio interferometers
Radio interferometry
Radio jets
Radio lobes
Radio loud quasars
Radio observatories
Radio occultation
Radio plumes
Radio pulsars
Radio quiet quasars
Radio receivers
Radio source catalogs
Radio source counts
Radio sources
Radio spectroscopy
Radio telescopes
Radioheliographs
Rapid bursts
Rapid stellar oscillations
RC Aurigae stars
Recombination (cosmology)
Recurrent novae
Red dwarf flare stars
Red giant branch
Red giant bump
Red giant clump
Red giant stars
Red giant tip
Red sequence galaxies
Red straggler stars
Red supergiant stars
Reddened stars
Reddening law
Redshift surveys
Redshifted
Reflecting telescopes
Reflection nebulae
Refracting telescopes
Reionization
Reissner–Nordström black holes
Relativistic aberration
Relativistic binary stars
Relativistic cosmology
Relativistic disks
Relativistic fluid dynamics
Relativistic jets
Relativistic mechanics
Relativistic stars
Relativity
Relaxation time
Remote telescope astrophotography
Resonant Kuiper belt objects
RGB photometry
RGU photometry
Right ascension
Ring galaxies
Ring nebulae
Ring singularities
Ritchey–Chrétien telescopes
Roche limit
Roche lobe
Rotating black holes
Rotating shells
Rotation powered pulsars
Rovers
RR Lyrae variable stars
RR Telescopii stars
RRA stars
RRab stars
RRb stars
RRc stars
RS Canum Venaticorum variable stars
Runaway stars
RV Tauri variable stars

S

S Doradus stars
S stars
S Vulpeculae stars
S-process
Sagittarius dwarf spheroidal galaxy
Saros cycle
Satellite formation
Saturn
Saturnian satellites
Scalar-tensor-vector gravity
Scale height
Scattered disk objects
Schmidt cameras
Schmidt-Cassegrain telescopes
Schwarzschild black holes
Schwarzschild metric
Schwarzschild radius
Sculptor dwarf elliptical galaxy
Seasonal phenomena
Secondary cosmic rays
Secular parallax
Sedna
Selenology
Semi-barium stars
Semi-detached binary stars
Semi-regular variable stars
Semimajor axis
Semiminor axis
Seyfert galaxies
Seyfert's sextant
Shadow bands
Shell burning
Shell stars
Shepherd satellites
Short period comets
Short period variable stars
Siderostats
Sigma8
Silicate grains
Silicon burning
Silicon monoxide masers
Silicon stars
Single X-ray stars
Single-dish antennas
Sky brightness
Sky noise
Sky surveys
Sloan photometry
Slow irregular variable stars
Slow novae
Small Magellanic Cloud
Small solar system bodies
Sociology of astronomy
Soft gamma ray repeaters
Solar abundances
Solar activity
Solar astronomy
Solar atmosphere
Solar atmospheric motions
Solar chromosphere
Solar composition
Solar constant
Solar core
Solar corona
Solar coronal holes
Solar coronal loops
Solar coronal streamers
Solar cycle
Solar diameter
Solar eclipses
Solar electromagnetic emission
Solar energetic particles
Solar evolution
Solar extreme ultraviolet emission
Solar faculae
Solar filaments
Solar flares
Solar gamma ray emission
Solar granulation
Solar instruments
Solar interior
Solar irradiance
Solar macrospicules
Solar magnetic fields
Solar magnetic reconnection
Solar magnetism
Solar mass
Solar motion
Solar nebulae
Solar neighborhood
Solar neutrino problem
Solar neutrinos
Solar neutrons
Solar observatories
Solar optical telescopes
Solar oscillations
Solar parallax
Solar particle emission
Solar photosphere
Solar prominences
Solar properties
Solar radiation
Solar radio emission
Solar radio telescopes
Solar rotation
Solar spicules
Solar storm
Solar surface
Solar system
Solar system astronomy
Solar system formation
Solar telescopes
Solar transition region
Solar ultraviolet emission
Solar wind
Solar wind termination
Solar X-ray emission
Solar-planetary interactions
Solar-terrestrial interactions
Solstice
South celestial pole
South ecliptic pole
South galactic pole
Space astrometry
Space debris
Space observatories
Space plasmas
Space probes
Space research
Space telescopes
Space vehicle instruments
Space vehicles
Spacetime metric
Special relativity
Speckle interferometry
Spectral index
Spectrometers
Spectrophotometric standards
Spectrophotometry
Spectroscopic binary stars
Spectroscopy
Spiral arms
Spiral galaxies
Spiral pitch angle
Spokes
Standard candles
Standard stars
Star atlases
Star clusters
Star counts
Star formation
Star forming regions
Starburst galaxies
Starlight polarization
Starspots
Statistical parallax
Steady-state theory
Stefan's quintet
Stellar abundances
Stellar accretion
Stellar accretion disks
Stellar activity
Stellar ages
Stellar associations
Stellar astronomy
Stellar atmospheres
Stellar atmospheric opacity
Stellar bow shocks
Stellar bridges
Stellar chemical composition
Stellar classification
Stellar colors
Stellar composition
Stellar cores
Stellar diffusion
Stellar disks
Stellar distance
Stellar dynamics
Stellar effective temperatures
Stellar elemental abundances
Stellar evolution
Stellar evolutionary tracks
Stellar faculae
Stellar feedback
Stellar flares
Stellar gas distribution
Stellar inner cores
Stellar interiors
Stellar jets
Stellar kinematics
Stellar luminosities
Stellar magnetic fields
Stellar mass black holes
Stellar mass functions
Stellar mass loss
Stellar masses
Stellar motion
Stellar nucleosynthesis
Stellar oscillations
Stellar parallax
Stellar phenomena
Stellar photometry
Stellar physics
Stellar populations
Stellar processes
Stellar properties
Stellar pulsations
Stellar radii
Stellar remnants
Stellar rings
Stellar rotation
Stellar spectral lines
Stellar structures
Stellar surfaces
Stellar tracking devices
Stellar types
Stellar wind bubbles
Stellar winds
Stellar x-ray flares
Stellar-interstellar interactions
Stone circles
Stratopause
Stratosphere
Strong gravitational lensing
Strontium stars
Strömgren photometric system
Strömgren spheres
SU Ursae Majoris stars
Subgiant stars
Submillimeter astronomy
Substellar companion stars
Summer solstice
Sunspot cycle
Sunspot groups
Sunspot number
Sunspots
Sunyaev-Zeldovich effect
Super Earths
Superbubbles
Superclusters
Supergalactic coordinate system
Supergalactic latitude
Supergalactic longitude
Supergiant stars
Supergranulation
Supermassive black holes
Supernova dynamics
Supernova evolution
Supernova neutrinos
Supernova remnants
Supernovae
Surface gravity
Surface photometry
Surveys
SX Arietis variable stars
SX Phoenicis variable stars
Symbiotic binary stars
Symbiotic novae
Synodic period
Syzygy

T

T associations
T dwarf stars
T subdwarf stars
T Tauri stars
Tailed radio galaxies
Technetium stars
Techniques
Teharonhiawako
Tektites
Telescope focal plane photography
Telescope mounts
Telescopes
Termination shock
Tertiary stars
The Moon
The Sun
Thermosphere
Three-body problem
Tidal disruption
Tidal distortion
Tidal friction
Tidal interaction
Tidal radius
Tidal tails
Tides
Timing variation methods
Total eclipses
Trans-Neptunian objects
Trans-Planckian physics
Transit duration variation method
Transit instruments
Transit photometry [Exoplanets]
Transit timing variation method
Transits
Triangulum Galaxy
Trigonometric parallax
Trinary stars
Trojan asteroids
Trojan planets
Tropopause
Troposphere
True anomaly
True position
Turnoff point
Twilight
Two-body problem
Two-color diagrams
Two-dimensional gravity
Two-spectrum binary stars
Twotinos
Type Ia supernovae
Type Ib supernovae
Type Ic supernovae
Type II supernovae

U

U Geminorum stars
Ultra-high-energy cosmic radiation
Ultracompact dwarf galaxies
Ultraluminous infrared galaxies
Ultraviolet astronomy
Ultraviolet color
Ultraviolet extinction
Ultraviolet observatories
Ultraviolet photometry
Ultraviolet sources
Ultraviolet surveys
Ultraviolet telescopes
Umbra
Unbarred spiral galaxies
Uncharged black holes
Underabundance
Upper atmosphere
Upsilon Sagittarii stars
Uranian satellites
Uranus
Urca process
Ursa Minor dwarf spheroidal galaxy
UU Herculis stars
UV Ceti stars
UV Persei stars
UX Ursae Majoris stars

V

Van Allen radiation belt
Variable radiation sources
Variable star period change
Variable stars
Varuna
Venus
Vernal equinox
Vertical circle
Very Large Array
Very Large Telescope
Very long baseline interferometers
Very long baseline interferometry
Very small grains
Vilnius photometry
Virgo Cluster
Virgo Supercluster
Virtual observatories
Visibility function
Visible astronomy
Visual binary stars
Visual observation
Voids
Volcanoes
von Zeipel theorem
VY Sculpturis stars

W

W Ursae Majoris variable stars
W Virginis variable stars
Walraven photometry
Warm dark matter
Warm ionized medium
Warm neutral medium
Warm-hot intergalactic medium
Water masers
Water vapor
Waveband photometry
WC stars
WCN stars
Weak G band stars
Weak gravitational lensing
Weak-line T Tauri stars
White dwarf evolution
White dwarf stars
Wide binary stars
Wide-field telescopes
Wilson effect
Wilson-Bappu Effect
Winter solstice
WN stars
Wolf diagram
Wolf-Rayet stars
Wormholes
WZ Sagittae stars

X

X-ray astronomy
X-ray binary stars
X-ray bright point
X-ray bursters
X-ray bursts
X-ray detectors
X-ray flares
X-ray identification
X-ray novae
X-ray observatories
X-ray photometry
X-ray quasars
X-ray sources
X-ray stars
X-ray surveys
X-ray telescopes
Xenobiology

Y

Y dwarf stars
Yellow hypergiant stars
Yellow stragglers
Yerkes classification
Yoke mounts
Young disk Cepheid variable stars
Young star clusters
Young stellar objects

Z

Z Andromedae stars
Z Camelopardalis stars
Zeeman–Doppler imaging
Zenith
Zenith hourly rate
Zenith telescopes
Zenith tubes
Zero-age horizontal branch stars
Zero-age main sequence stars
Zirconium stars
Zodiacal cloud
Zone of totality
ZZ Ceti stars