F star
F-1 (rocket engine)
F-14 Tomcat
Faber-Jackson relation
Fabricius, David (1564-1617) and Johann (1587-1615)
Fabry, Marie Paul Auguste Charles (1867-1945)
Fabry lens
Fabry-Pérot interferometer
face
"face," on Mars
facial nerve
factor
factor VIII
factorial
factorion
facula
Fadiman, Clifton (1904-1999)
Faget, Maxime A. (1921-2004)
Fagnano's problem
fairing
Falcon 1
Fallopian tube
fall-away section
false alarms, in SETI
false memory syndrome
FAME
family
Fanaroff-Riley classification
Fanconi anemia
farad
Faraday, Michael (1791-1867)
Faraday cage
Faraday rotation
Farey sequence
fascia
FAST (Fast Auroral Snapshot Explorer)
fast neutron
fast reactor
faster-than-light (FTL) travel
fastest spacecraft
Fastrac engine
fat (triacylglycerol)
fatty acids
fault
fault scarp
Faye, Herve (1814-1902)
Faye's Comet
F-class asteroid
feather
Fechner, Gustav Theodor (1801-1887)
Fedorov, E. S. (1853-1919)
feedback
Feigenbaum’s constant
feldspar
female genital tract
female reproductive system
female sexual response and hormone control
femur
Feoktistov, Konstantin Petrovich (1926-)
Fermat, Pierre de (1601-1665)
Fermat number
Fermat's last theorem
Fermat's little theorem
Fermat's spiral
fermi (unit)
Fermi, Enrico (1901-1954)
Fermi acceleration
Fermi level
Fermi Paradox
Fermi-Dirac statistics
fermion
ferret (military satellite)
ferromagnetism
fertile material
fetus
fever
Feynman diagram
Feynman sum-over-paths
FG Sagittae
FGK stars
Fibonacci (c.1175-1250)
Fibonacci sequence
fibril
fibrin
fibrinogen
fibroblast
fibrous proteins
fibula
field
field curvature
field galaxy
field lens
field of view
field rotation
field star
field stop
field theory
Fifteen Puzzle
figurate number
figuring
filament
filigree
films and plays involving mathematics
filter
filtergram
fin
final helium flash object
find
fine structure
fine structure constant
finger
Finger, Harold B. (1924-)
finite
finite-state automaton
fire point
fireball
firing chamber
first contact
"first light"
first lunar meridian
First Men in the Moon
first motion
firsts in spaceflight
Fischer-Tropsch reaction
fish
Fisher, Adrian
fissile material
fission, cellular
fission, nuclear
fissure
Fitchneal
five
fixed star
fixed-point attractor
FK Comae Berenices star
flagellum
flame bucket
flame deflector
Flame Nebula (NGC 2024)
Flaming Star Nebula (IC 405)
Flammarion, Camille (1842-1925)
Flamsteed, John (1646-1719)
Flamsteed number
flap
flare
flare star
flash spectrum
flashback
flashpoint
flat
flat field
Flatland: A Romance of Many Dimensions
flatworm
flavor
Fleming, Williamina Paton Stevens (1857-1911)
Fletcher, James Chipman (1919-1991)
flexagon
FLIERs (fast, low ionization emission regions)
flight acceptance test
flight path
flight path angle
flight profile
flight readiness firing
Flight Research Center
flight simulator
flight test
flint glass
floor function
Flora family (of asteroids)
flower
FLTSATCOM (Fleet Satellite Communications)
fluid
fluid dynamics
fluid flow
fluoresence
fluoresence in situ hybridization
fluorine
flux
flux collector
flux density
flux tube
fly-away disconnects
fly-between-trains problem
flyby
Flying Bedstead (Rolls-Royce Thrust Measuring Rig)
flying disk
flying saucer
Fobos
FOBS (Fractional Orbital Bombardment System)
focal chord
focal length
focal plane
focal point
focal radius
focal ratio
focal reducer
focus
focus, orbital
Fokker-Planck equation
foliation
folic acid
folium
follicle
follicle-stimulating hormone
following
Follow-Up Detection Device (FUDD)
Fomalhaut (Alpha Piscis Austrini)
Fontana, Giovanni da (1395-1455)
fontanelle
Fontanelle, Bernard le Bovier de (1657-1757)
"foo fighters"
foot
footprint
foramen
foramen magnum
forbidden line
Forbidden Planet
Forbush decrease
force
force charge
forces of flight
forebrain
formal system
formaldehyde
formalism
formation age
formation interval
Fornax (constellation)
Fornax A
Fornax Cluster
Fornax Dwarf
forsterite
FORTE (Fast On-orbit Recording of Transient Events)
fortean falls
Fortune's conjecture
Forward, Robert L(ull) (1932-2002)
forward scattering
forward-contamination
"fossils", Martian
Foucault, Jean Bernard Léon (1819-1868)
Foucault knife-edge test
Foucault pendulum
four
four coins problem
four fours problem
four knights puzzle
four-color problem
Fourier, (Jean Baptiste) Joseph, Baron (1768-1830)
Fourier analysis
Fourier series
fourth dimension
fovea
Fowler, William (“Willy”) Alfred (1911-1995)
Fox, Sidney W. (1912-1998)
Fp star
fractal
fraction
fragile X syndrome
frame-dragging
FRANCE IN SPACE
Franklin, Benjamin (1706-1790)
Franklin-Adams charts
Fraser spiral
Fraunhofer, Joseph von (1787-1826)
Fraunhofer lines
Fred Lawrence Whipple Observatory
Fredholm, Erik Ivar (1866-1927)
free electron
free oxygen
free radical
free-bound transition
freefall
free-free transition
Freemish crate
Frege, Friedrich Ludwig Gottlob (1848-1925)
Freitas, Robert
French Space Agency
Frénicle de Bessy, Bernard (1602-1675)
frequency
frequency bands
friction
Friedman, Herbert (1916-)
Friedmann, Aleksandr Aleksandrovich (1888-1925)
fringing
Frogs and Toads puzzle
frogs in stones
Froissart, Jean (c.1337-1410)
From the Earth to the Moon
frontal bone
fructose
fruit
frustrum
Frosch, Robert A. (1928-)
FU Orionis star
fuel
fuel cell
fuel element
fuel rod
Fuji
fullerene
Full-sky Astrometric Mapping Explorer (FAME)
fumarole
function
functional analysis
functional group
fundamental catalogue
fundamental group
Fundamental Katalog (FK)
fundamental particle
fundamental theorem of algebra
fundamental theorem of arithmetic
fundamental star
fungi
funny bone
FUSE (Far Ultraviolet Spectroscopic Explorer)
fuselage
fusion propulsion, microwave-induced
fusion, nuclear
fusion crust
future lightcone
Fuyo
fuzzy logic