- faculae
- A bright region of the photosphere seen
in white light, seldom visible except near the solar
limb.
fault
- A crack or break in the crust of a planet along which slippage or
movement can take place.
filament
- A strand of cool gas suspended over the
photosphere by magnetic fields, which
appears dark as seen against the disk of the Sun;
a filament on the limb of the Sun seen in
emission against the dark sky is called a
prominence.
fissure
- A narrow opening or crack of considerable length and depth.
flare
- A sudden eruption of energy on the solar disk
lasting minutes to hours, from which radiation and particles are emitted.
flexus
- A cuspate linear feature
fluctus
- A flow terrain
fossa
- A long, narrow, shallow depression.
Franklin, Benjamin 1706-1790
- American public official, writer, and scientist. Franklin played a major role
in the American Revolution and helped draft the Constitution. His numerous scientific and practical innovations include the lightning rod, bifocal spectacles, and a stove.
