lith - Lyma
- lithium poor stars
- lithium rich stars
- lithium stars
- lithospheres
- LMC
- lobes
- local group of galaxies
- local standard of rest
- local supercluster
- local thermodynamic equilibrium
- long baseline interferometers
- long baseline interferometry
- long period comets
- long period variable stars
- long slit spectra
- longitude
- loops
- low luminosity stars
- low mass stars
