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A
edit- Absolute magnitude
- Absorption band
- Abundance of the chemical elements
- Accelerating universe
- Accretion disc
- Active galactic nucleus
- Active galaxy
- Age of the universe
- Albedo
- Algol variable
- Alternatives to general relativity
- Andromeda Galaxy
- Andromeda–Milky Way collision
- Angular diameter
- Angular resolution
- Anisotropy
- Anthropic principle
- Apparent magnitude
- Apsis
- Astronomical naming conventions
- Astronomical object
- Astronomical radio source
- Astronomical spectroscopy
- Astronomical system of units
- Astronomical unit
- Astronomy
- Asymptotic giant branch
- Atomic spectral line