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Our Home Planet
Earth is an ocean planet. Our home world's abundance of water -- and life -- makes it unique in our solar system. Other planets, plus a few moons, have ice, atmospheres, seasons and even weather, but only on Earth does the whole complicated mix come together in a way that encourages life -- and lots of it.

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  News Features People Extreme Facts Dictionary

 
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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.
 
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.