F stars
/ / / F stars / /
Faculae
/ / / Faculae / /
Famalhout
/ / / Famalhout / /
Fast telescope
/ / / Fast telescope / /
Fibrils
/ / / Fibrils / /
Field curvature
/ / / Field curvature / /
Field of view
/ / / Field of view / /
field rotation
/ / / field rotation / /
Filament
/ / / Filament / /
finderscope
فایندر / / / finderscope / /
First quarter moon
/ / / First quarter moon / /
FK Comae variable stars
/ / / FK Comae variable stars / FKCOM /
Flare
/ / / Flare / /
Flare stars
ستاره های متغییر UV قیطسی / / / Flare stars / UV Ceti variable stars /
Focul point
/ / / Focul point / /
Focul ratio
/ / / Focul ratio / /
focuser
/ / / focuser / /
fornax
/ / / fornax / furnace / For
FU Orionis variable stars
/ / / FU Orionis variable stars / /
Full moon
ماه کامل / / / Full moon / /
Glast space telescope
/ / / Glast space telescope / Fermi Gamma-ray Space Telescope /
pisces
حوت / سمکتین / / pisces / fishes / Psc
volans
/ / / volans / flying fish / Vol
