Reference Terms
from Wikipedia, the free encyclopedia

Electromagnetic spectrum

The electromagnetic spectrum is the range of all possible electromagnetic radiation.

Above infrared in frequency comes visible light.

This is the range in which the sun and stars similar to it emit most of their radiation.

Nearly all objects in the universe emit, reflect and/or transmit some light. (One hypothetical exception may be dark matter.) The distribution of this light along the electromagnetic spectrum (called the spectrum of the object) is determined by the object's composition.

Note:   The above text is excerpted from the Wikipedia article "Electromagnetic spectrum", which has been released under the GNU Free Documentation License.
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