DICTIONARY LOOKUP
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Jewel of Our Solar System
Adorned with thousands of beautiful ringlets, Saturn is unique among the planets. All four gas giant planets have rings -- made of chunks of ice and rock -- but none are as spectacular or as complicated as Saturn's. Like the other gas giants, Saturn is mostly a massive ball of hydrogen and helium.

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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