The visibal portion of the electromagnetic spectrum is in the middle and comprises a portion of that energy. On either end are the color spectrum portions below red is infrared and above blue is ultraviolet. Some creatures on Earth can see in the ultra and infra portion of the spectrum. The human eye is not usually one of them without some sort of mechanical enhancement. To see the spectrum at work on the Space Telescope view the video below.
Kevin Griffiths
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