DICTIONARY LOOKUP
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Our Nearest Neighbor
Did you know the moon has an atmosphere? NASA's LADEE is headed to the moon to find out more about the mysterious composition of the thin lunar exosphere.

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  News Features People Extreme Facts Dictionary

 
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Watt

A unit of power, equivalent to one joule of energy per second.

wavelength

The distance between successive crests or troughs in a wave.

weathering

The chemical and physical alteration of materials exposed to the environment on or near the surface of a planetary body.

 
Can't find it? Don't understand it? Ask us.
Q
Watt

A unit of power, equivalent to one joule of energy per second.

wavelength

The distance between successive crests or troughs in a wave.

weathering

The chemical and physical alteration of materials exposed to the environment on or near the surface of a planetary body.