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* [[Spacecraft]] – ''a category that includes all spacecraft except space telescopes''
* [[Telescope]] – ''a category that includes both ground-based and space telescopes; organizations that operate telescopes (for example, the [[National Optical Astronomy Observatory|National Optical Astronomy Observatory (NOAO)]]) are listed under "organization"''
== A ==
* [[Astronomy & Astrophysics|A&A]] – (''publication'') Astronomy & Astrophysics, ''a European scientific journal''
* AAA – (''organization'') Amateur Astronomers Association of New York
* [[Australian Astronomical Observatory|AAO]] – (''organization'') Australian Astronomical Observatory (prior to 1 July 2010: Anglo-Australian Observatory)
* [[American Astronomical Society|AAS]] – (''organization'') American Astronomical Society
* [[Anglo-Australian Telescope|AAT]] – (''telescope'') Anglo-Australian Telescope
* [[American Association of Variable Star Observers|AAVSO]] – (''organization'') American Association of Variable Star Observers
* [[ADC Backend For Bolometer Array|ABBA]] – ADC Backend For Bolometer Array
* [[A Broadband Imaging X-ray All-sky Survey|ABRIXAS]] – (''observing program'') A BRoadband Imaging X-ray All-sky Survey
* [[Catalogue Astrographique|AC]] – (''catalog'') Catalogue Astrographique
* [[Advanced Composition Explorer|ACE]] – (''spacecraft'') Advanced Composition Explorer
* [[Chandra X-ray Observatory|ACIS]] – (''instrumentation'') Advanced CCD Imaging Spectrometer, ''an instrument on the [[Chandra X-Ray Observatory]]''
* ACM – (''meeting'') Asteroids, Comets, and Meteors
* ACP – (''instrumentation'') – Aerosol Collector and Pyrolyser, ''an instrument on the [[Huygens probe]]''
* [[Advanced Camera for Surveys|ACS]] – (''instrumentation'') Advanced Camera for Surveys, ''an instrument on the Hubble Space Telescope''
* [[Alpha2 Canum Venaticorum variable|ACV]] – (''celestial object'') Alpha Canes Venatici, ''a class of rotating [[variable star]]s with strong [[magnetic field]]s named after [[Cor Caroli|Alpha Canum Venaticorum (Cor Caroli)]], the archetype for the class''
* [[Alpha Cygni variable|ACYG]] – (''celestial object'') Alpha CYGni, ''a class of rotating [[variable star]]s named after [[Deneb|Alpha Cygni (Deneb)]], the archetype for the class''
* [[Advection-dominated accretion flow|ADAF]] – (''astrophysics terminology'') Advection Dominated Accretion Flow, ''a mechanism by which matter is slowly accreted onto a [[black hole]]''
* [[Astronomical Data Center|ADC]] – (''organization'') Astronomical Data Center
* [[Astrophysics Data Centers Executive Council|ADEC]] – (''organization'') Astrophysics Data Centers Executive Council, ''an organization that provides oversight for the [[Astrophysics Data and Information Services]]''
* [[Astrophysics Data Facility|ADF]] – (''organization'') Astrophysics Data Facility
* ADS – (''catalog'') Aitken Double Stars
* [[Astrophysics Data and Information Services|ADIS]] – (''organization'') Astrophysics Data and Information Services
* [[Astrophysics Data System|ADS]] – (''organization'') Astrophysics Data Service, ''an organization that maintains an online database of scientific articles''
* [[Air Force Geophysics Laboratory|AFGL]] – (''organization'') Air Force Geophysics Laboratory, ''a research laboratory now part of the United States [[Air Force Research Laboratory]]''
* [[Association française des observateurs d'étoiles variables|AFOEV]] – (''organization'') Association française des observateurs d'étoiles variables
* [[Astronomische Gesellschaft|AG]] – (''organization'') Astronomische Gesellschaft
* [[Andromeda Galaxy and Amplified Pixels Experiment|AGAPE]] – (''observing program'') Andromeda Galaxy and Amplified Pixels Experiment, ''a search for [[microlens]]es in front of the [[Andromeda Galaxy]]''
* [[Asymptotic Giant Branch|AGB]] – (''celestial object'') Asymptotic Giant Branch, ''a description for a type of [[red giant|red giant star]]''
* AGK – (''catalog'') Astronomische Gesellschaft Katalog
* [[Active Galactic Nucleus|AGN]] – (''celestial object'') Active Galactic Nucleus
* [[American Geophysical Union|AGU]] – (''organization'') American Geophysical Union
* [[Aeronomy of Ice in the Mesosphere|AIM]] – (''spacecraft'') Aeronomy of Ice in the Mesosphere, ''a spacecraft that will study the [[Noctilucent cloud]]s''
* [[Astronomical Image Processing System|AIPS]] – (''software'') Astronomical Image Processing System
* [[Astronomical Journal|AJ]] – (''publication'') Astronomical Journal
* [[ALaMO]] – (''organization'') Automated Lunar and Meteor Observatory
* [[Array of Low Energy X-ray Imaging Sensors|ALEXIS]] – (''instrumentation'') Array of Low Energy X-ray Imaging Sensors
* [[Atacama Large Millimeter Array|ALMA]] – (''telescope'') Atacama Large Millimeter/Sub-millimeter Array
* [[Association of Lunar and Planetary Observers|ALPO]] – (''organization'') Association of Lunar and Planetary Observers
* [[Antarctic Muon And Neutrino Detector Array|AMANDA]] – (''telescope'') Antarctic Muon And Neutrino Detector Array, ''a [[neutrino telescope]]''
* [[Astrophysics Multi-spectral Archive Search Engine|AMASE]] – (''software'') Astrophysics Multi-spectral Archive Search Engine
* [[American Meteor Society|AMS]] – (''organization'') American Meteor Society
* [[Astronomische Nachrichten|AN]] – (''publication'') Astronomische Nachrichten, ''a German scientific journal''
* [[Astronomical Netherlands Satellite|ANS]] – (''telescope'') Astronomical Netherlands Satellite
* [[Astro News Service|ANS]] – (''organization'') Astro News Service
* [[American National Standards Institute|ANSI]] – (''organization'') American National Standards Institute
* [[Adaptive Optics|AO]] – (''instrumentation'') Adaptive Optics
* [[Astronomical Observation Request|AOR]] – (''instrumentation'') Astronomical Observation Request
* [[Astrophysical Journal|ApJ]] – (''publication'') Astrophysical Journal
** [[Astrophysical Journal Letters|ApJL]] – (''publication'') Astrophysical Journal Letters
** [[Astrophysical Journal Supplement Series|ApJS]] – (''publication'') Astrophysical Journal Supplement Series
* APM – (''instrumentation''/''catalog''), Automatic Plate Measuring machine, ''describes both a machine for making measurements from photographic plates and a catalog based on measurements by the machine''
* [[Apache Point Observatory|APO]] – (''organization'') Apache Point Observatory
* [[Astronomy Picture of the Day|APOD]] – (''data'') Astronomy Picture of the Day
* [[Automated Patrol Telescope|APT]] – (''telescope'') Automated Patrol Telescope
* [[Ames Research Center|ARC]] – (''organization'') Ames Research Center
* [[Astrophysical Research Consortium|ARC]] – (''organization'') Astrophysical Research Consortium
* [[Astronomical Society of the Atlantic|ASA]] – (''organization'') Astronomical Society of the Atlantic
* [[Agenzia Spaziale Italiana|ASI]] – (''organization'') Agenzia Spaziale Italiana
* [[Academia Sinica Institute of Astronomy and Astrophysics|ASIAA]] – (''organization'') Academia Sinica Institute of Astronomy and Astrophysics
* [[Astronomical Society of the Pacific|ASP]] – (''organization'') Astronomical Society of the Pacific
* [[Orbital Express|ASTRO]] – (''spacecraft'') Autonomous Space Transport Robotic Operations
* [[Allen Telescope Array|ATA]] – (''telescope'') Allen Telescope Array, ''a radio [[Astronomical interferometer|interferometer array]] developed by the [[SETI Institute]] to search for possible signals from extraterrestrial life''
* [[Australia Telescope Compact Array|ATCA]] – (''telescope'') Australia Telescope Compact Array
* [[Amateur telescope making|ATM]] – (''person'') hobbyist engaged in ''[[Amateur telescope making]]'' (may also refer to the book of the same title, [[Amateur Telescope Making]])
* [[Astronomical Unit|AU]] – (''measurement'') Astronomical Unit, ''the distance between the Earth and the Sun''
* [[Arab Union for Astronomy and Space Sciences|AUASS]] – (''organization'') Arab Union for Astronomy and Space Sciences
* [[Association of Universities for Research in Astronomy|AURA]] – (''organization'') Association of Universities for Research in Astronomy
* [[International Workshop on Cometary Astronomy|AWCA]] – (''meeting'') American Workshop on Cometary Astronomy, ''an older name for the [[International Workshop on Cometary Astronomy]]''
* [[Anomalous X-ray pulsar|AXP]] – (''celestial object'') Anomalous X-Ray Pulsar
* [[Chandra X-ray Observatory|AXAF]] – (''telescope'') Advanced X-ray Astrophysics Facility, ''an older name for the [[Chandra X-ray Observatory]]''
== B ==
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