DICTIONARY LOOKUP
I need help with a report about...


The Swiftest Planet
Sun-scorched Mercury is only slightly larger than Earth's moon. Like the moon, Mercury has very little atmosphere to stop impacts, and it is covered with craters. Mercury's dayside is super-heated by the sun, but at night temperatures drop hundreds of degrees below freezing. Ice may even exist in craters. Mercury's egg-shaped orbit takes it around the sun every 88 days.

Mercury Icon
Just the Facts
Just the Facts
Dig Deeper
Dig Deeper
Dig Deeper
Create Your Report
Create Your Report
Even More Stuff...
Even More Stuff...
  News Features People Extreme Facts Dictionary

 
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.

 
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.