Academia Sinica Institute of Astronomy and Astrophysics
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ASIAA (organization)
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DEep Near Infrared Survey
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DENIS (observing program/catalog)
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1ROSAT X-ray Survey
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1RXS (catalog)
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1st ROSAT X-ray HRI
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1RXH (catalog)
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2dF-SDSS LRG And QSO survey
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2SLAQ (observing program)
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A Broadband Imaging X-ray All-sky Survey
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ABRIXAS (observing program)
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A set of asteroid discoveries in the 1960s
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P-L
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Active Galactic Nucleus
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AGN (celestial object)
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Adaptive Optics
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AO (instrumentation)
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Advanced Camera for Surveys
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ACS (instrumentation)
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Advanced CCD Imaging Spectrometer
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ACIS (instrumentation)
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Advanced Composition Explorer
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ACE (spacecraft)
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Advanced X-ray Astrophysics Facility
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AXAF (telescope)
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Advection Dominated Accretion Flow
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ADAF (astrophysics terminology)
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Aeronomy of Ice in the Mesosphere
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AIM (spacecraft)
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Aerosol Collector and Pyrolyser
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ACP (instrumentation)
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Agenzia Spaziale Italiana
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ASI (organization)
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Air Force Geophysics Laboratory
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AFGL (organization)
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Aitken Double Stars
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ADS (catalog)
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Alpha Canes Venatici
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ACV (celestial object)
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Alpha CYGni
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ACYG (celestial object)
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American Association of Variable Star Observers
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AAVSO (organization)
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American Astronomical Society
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AAS (organization)
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American Geophysical Union
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AGU (organization)
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American Meteor Society
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AMS (organization)
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American National Standards Institute
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ANSI (organization)
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