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
ultraviolet

Light that is so blue humans cannot see it. A band of the electromagnetic spectrum between the visible and the X-ray. Photons of ultraviolet light are more energetic than photons of visible light.

umbra

The dark central region of a sunspot.

undae

Dunes (literally 'waves').

Uranus
Uranus is the seventh planet from the sun. It is the third largest planet in our solar system. Uranus is named for the Roman god who is father of the Titans.
HREF="../planets/profile.cfm?Object=Uranus">More on Uranus >>

Uranus and moons Miranda and Ariel
 
Can't find it? Don't understand it? Ask us.
Q
ultraviolet

Light that is so blue humans cannot see it. A band of the electromagnetic spectrum between the visible and the X-ray. Photons of ultraviolet light are more energetic than photons of visible light.

umbra

The dark central region of a sunspot.

undae

Dunes (literally 'waves').

Uranus
Uranus is the seventh planet from the sun. It is the third largest planet in our solar system. Uranus is named for the Roman god who is father of the Titans.
HREF="../planets/profile.cfm?Object=Uranus">More on Uranus >>

Uranus and moons Miranda and Ariel