- Gal
- gal
- galactan
- galactase
- Galactic absorbing layer
- galactic absorbing layer
- Galactic absorption
- galactic absorption
- galactic age
- Galactic aggregate
- Galactic anticenter
- Galactic arm
- galactic arm
- Galactic arm-population
- Galactic astronomy
- galactic astronomy
- Galactic astrophysics
- galactic astrophysics
- Galactic background
- Galactic background infrared radiation
- Galactic background radiation
- Galactic background radio radiation
- Galactic background X-ray radiation
- Galactic background γ-ray radiation
- Galactic bar