DICTIONARY LOOKUP
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Our Nearest Neighbor
Our moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate, and creating a tidal rhythm that has guided humans for thousands of years. The moon was likely formed after a Mars-sized body collided with Earth and the debris formed into the most prominent feature in our night sky.

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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.