DICTIONARY LOOKUP
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Mysterious Tiny Worlds
Dwarf planets are round and orbit the Sun just like the eight major planets. But unlike planets, dwarf planets are not able to clear their orbital path so there are no similar objects at roughly the same distance from the Sun. A dwarf planet is much smaller than a planet (smaller even than Earth's moon), but it is not a moon. Pluto is the best known of the dwarf planets.

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  News Features People Extreme Facts Dictionary

 
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facula

A circular to subcircular region which is brighter than the surrounding area.

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.

Filament on the fiery surface of the sun.
fireball

A bright meteor.

fissure

a narrow opening or crack of considerable length and depth.

fluctus

Flow terrain.

fossa

A long, narrow, shallow depression.

fracture

A break or crack.

friction

The rubbing of one surface or thing again another.

 
Can't find it? Don't understand it? Ask us.
Q
facula

A circular to subcircular region which is brighter than the surrounding area.

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.

Filament on the fiery surface of the sun.
fireball

A bright meteor.

fissure

a narrow opening or crack of considerable length and depth.

fluctus

Flow terrain.

fossa

A long, narrow, shallow depression.

fracture

A break or crack.

friction

The rubbing of one surface or thing again another.