facula
- bright spot.
- farrum
- pancake-like structure
- 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.
- fireball
- a meteor brighter than
magnitude -3
- 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
- cuspate (pointed) linear feature.
- fluctus
- flow terrain.
- fossa
- long, narrow, shallow depression.
- Franklin, Benjamin
1706-1790
- American public official, writer, and scientist.
Played a major part in the American Revolution
and helped draft the Constitution. His numerous
scientific and practical innovations include the
lightning rod, bifocal spectacles, and a stove.
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