DICTIONARY LOOKUP
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Space Rocks
Little chunks of rock and debris in space are called meteoroids. They become meteors -- or shooting stars -- when they fall through a planet's atmosphere; leaving a bright trail as they are heated to incandescence by the friction of the atmosphere. Pieces that survive the journey and hit the ground are called meteorites.

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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