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A
     Aberration
     Absolute zero
     Absorption
     Abundance
     Accelerometer
     Accretion (disk, zone)
     Active galactic nucleus (AGN)
     Active galaxy
     Aeronomy
     Aerosol
     Aerosol collector
     Algol
     Alignment
     Altitude
     Angstrom
     Anisotropy, Inhomogeneity (in the cosmic microwave background)
     Antenna (high gain, low gain)
     Antimatter
     Aperture
     Aphelion
     Apocentre
     Apogee
     Arcmin, arcsec
     Argon
     Ariane (4, 5) rockets
     Asteroid
     Asteroid belt
     Astigmatism
     Astrometry
     Attitude
     Astronomical Unit (AU)
     Astronomy
     Astrophysics
     Atmosphere
     Aurora

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B
     Baffle
     Baryons
     BepiColombo mission
     BeppoSAX satellite
     Big Bang
     Big Crunch
     Billion
     Binary star
     Black hole
     Blazar
     Blueshift
     Bolometer
     Bremsstrahlung
     Brown dwarf

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C
     Capture orbit
     Carbonaceous compounds
     Cassegrain telescope
     Cassini division
     Cassini-Huygens mission
     Cataclysmic variable
     Celsius (oC)
     Centaur (rocket)
     Cepheid variable
     Charged particles
     Checkout
     Chromosphere
     Climatology
     Closed Universe
     Cluster mission
     Cosmic microwave background radiation
     Coast phase
     Coded mask
     Cold dark matter
     Coma
     Comet
     Compton scattering (and inverse compton scattering)
     Concave
     Conductivity, thermal
     Convection
     Convection model
     Convex
     Core
     Cornerstone
     Corona
     Coronal mass ejection (CME)
     Coronagraph
     Cosmic Background Explorer (COBE) satellite
     Cosmic rays
     Cosmology
     Crater
     Critical density
     Cruise phase
     Crust
     Cryostat
     Cygnus X-1
     Cygnus X-3

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D
     Dark matter
     Darwin mission
     Data
     Decaying orbit
     Deep Space Network (DSN)
     Density
     Descent phase
     Differential rotation
     Diffraction grating
     Diffuse X-ray background
     Diode
     Dispersion
     Doppler shift
     Drag
     Dust (cosmic, interstellar)

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E
     Earth
     Eclipse, solar
     Eclipse, lunar
     Ecliptic plane
     Effective area
     Einstein Cosmological Constant (lambda)
     Electric propulsion
     Electromagnetic radiation
     Electromagnetic spectrum
     Electron
     Electron-positron annihilation
     Electronvolt (eV)
     Element
     Elliptical orbit
     Emission
     Energy
     European Space Agency (ESA)
     Escape velocity
     Ethane
     Exobiology
     EXOSAT satellite
     Extinction
     Extragalactic
     Extravehicular
     Extreme ultraviolet (EUV)

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F
     Facula
     Fahrenheit (oF)
     Field of view (FOV)
     Filament
     Filter (wheel)
     FIRST mission
     Flat Universe
     Fluctuations (in the cosmic microwave background)
     Fly-by
     Focal plane
     Focus
     French Guiana
     Frequency
     Fusion

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G
     Gaia mission
     Galaxy
     Galaxy clusters
     Gamma ray
     Gamma-ray astronomy
     Gamma-ray burst (GRB)
     Ganymede
     General Relativity
     Germanium detector
     Giotto mission
     Granulation
     Grating (transmission, reflection)
     Gravitational (arc, lens)
     Gravitational field
     Gravitational wave
     Gravity
     Gravity assist
     Grazing incidence
     Grigg-Skjellerup (comet)
     Ground segment
     Guaranteed time
     Gyroscope

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H
     Hale-Bopp (comet)
     Halley (comet)
     Half-energy width
     Heat capacity
     Heat shield
     Heliocentric
     Helioseismology
     Heliosphere
     Herschel (formerly FIRST) mission
     Hertz (Hz)
     Hertzsprung-Russell (HR) diagram
     Hipparcos mission
     Hubble Constant
     Hubble Law
     Hubble Space Telescope (HST) mission
     Huygens mission
     Hydrazine
     Hydrocarbons
     Hyperbolic

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I
     Igneous rock
     Illuminated (back/front)
     Image
     Imager
     Imaging
     Impact crater
     Inclination angle
     Inflationary Universe
     Infrared Astronomical Satellite (IRAS)
     Infrared light
     Infrared Space Observatory (ISO) mission
     Injection (into orbit)
     Instrument
     INTEGRAL mission
     Integration (satellite, instrument)
     Interferometer
     Interferometry
     International Ultraviolet Explorer (IUE) emission
     Interplanetary voyage
     Interstellar
     Ion
     Isotope
     Isotropy

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J
     Jupiter

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K
     K-band
     Kelvin
     Kourou
     Kuiper Belt

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L
     Lagrangian points
     Lander
     Latch
     Launch window
     Launcher
     Lens
     Leonids
     Light
     Light elements
     Lightning
     Light-year (ly)
     Line (absorption)
     Luminosity

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M
     Mach number
     Magnetic field
     Magnetic force
     Magnetometer
     Magnetopause
     Magnetosphere
     Magnitude, absolute (M)
     Magnitude, apparent (m)
     Main sequence
     Mandrel
     Mantle
     Manufacturing
     Mars
     Mars Express mission
     Mass
     Matter
     Measurements (in-situ)
     Measurements (remote)
     Mercury
     Meteor
     Meteor shower
     Meteorite
     Meteoroid
     Methane
     Microgravity
     Micron
     Microwave
     Microwave Anisotropy Probe (MAP)
     Milky Way
     Mirror
     Module (satellite)
     Molecular cloud
     Monitor
     Moon
     Multimirror
     Multi-wavelength (observations)

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N
     Near-Earth asteroid
     Nebula
     Neptune
     Neutrino
     Neutron
     Neutron star
     Next Generation Space Telescope (NGST) mission
     Nitrogen
     Non-baryonic matter
     Nova
     Nuclear fusion
     Nucleosynthesis
     Nucleus

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O
     Occultation
     Oort cloud
     Open Universe
     Opposition
     Optical light ('visible' light)
     Optics
     Orbit
     Orbit acquisition
     Orbiter
     Organics
     Orientation
     Ozone layer

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P
     Parabolic (mirror)
     Parallax
     Parsec (pc)
     Particle(s)
     Payload
     Payload module
     Periapsis
     Pericentre
     Perigee
     Perihelic opposition
     Perihelion
     Period
     Photochemistry
     Photometer
     Photon
     Picture
     Pipe-line (processing)
     Pixel
     Planck constant
     Planck's Law
     Planck mission
     Plane (focal)
     Planet
     Planetary nebula
     Plasma
     Platform
     Pleiades
     Plumes
     Pluto
     Pole
     Polarisation
     Positron
     Prebiotic
     Preliminary design review
     Primaeval soup
     Primary mirror
     Primordial nucleosynthesis
     Prism
     Probe
     Prominence (solar)
     Proportional counter
     Propulsion
     Proton
     Proton rocket
     Protoplanetary disc
     Protostellar object
     Pulsar
     Pyrolyser

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Q
     Qualification model
     Quantum (theory, mechanics)
     Quark
     Quasar
     Quick-look analysis

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R
     Radiation
     Radiation belt (van Allen)
     Radio waves
     Radioactivity
     Reboost
     Recombination era
     Red Giant
     Redshift
     Reduction
     Reflecting telescope
     Reflector
     Refracting telescope
     Replication
     Resolution (angular, spectral)
     Retrograde
     Revolution
     Rings (Saturn's)
     Ritchey-Chretien
     Robot
     Roche limit
     Rocket
     ROSAT satellite
     Rosetta mission
     Rotation
     Rover

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S
     S-band
     Sagittarius
     Satellite
     Saturn
     Secondary mirror
     Sedimentary rock
     Separation (satellite)
     Serendipity
     Service module
     Servicing mission
     Seyfert (galaxy)
     Shell
     Shoemaker-Levy 9 (comet)
     SMART-1 mission
     Solar and Heliospheric Observatory (SOHO) mission
     Solar array
     Solar flare
     Solar storm
     Solar System
     Solar wind
     Source
     Soyuz (-Fregat) rocket
     Spacecraft
     Space Infrared Telescope Facility (SIRTF)
     Space weather
     Spectral class (of a star)
     Spectral lines
     Spectrophotometers
     Spectrograph
     Spectrometer
     Spectrometer (Mossbauer)
     Spectrometer (mass)
     Spectroscopy
     Spectrum
     Spherical aberration
     Stability (satellite)
     Star
     Starburst (galaxies)
     Stratospheric Observatory For Infrared Astronomy (SOFIA)
     Structural and thermal model
     Sublimation
     Submillimetre (sub-mm)
     Sun
     Sunspot
     Sunspot cycle
     Supernova
     Synchrotron radiation
     Systems engineering review
     Swing-by

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T
     Telemetry
     Telescope
     Telescope (Wolter)
     Temperature
     Terrestrial planets
     Testing (spacecraft)
     Thermal gradient
     Thrusters
     Titan
     Tracking
     Tube

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U
     Uhuru satellite
     Ultra Luminous Infrared Galaxies (ULIRG)
     Ultraviolet light
     Ulysses mission
     Universe
     Uranus

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V
     Van Allen radiation belt
     Vacuum
     Venus
     Visibility
     Volt (V)
     Voyager satellite

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W
     Watt (W)
     Wavelength
     White dwarf
     Wirtanen (comet)

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X
     X-band
     XEUS mission
     XMM-NEWTON (X-ray Multi-Mirror) mission
     X-ray
     X-ray (hard)
     X-ray (soft)

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Z
     Zonal wind

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Last update: 18 September 2001