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The "electromagnetic spectrum" is a term used to describe the entire range of light radiation, from gamma rays to radio waves. We tend to think of optical radiation as "light," but the rainbow of colors that make up optical or "visible" light is just a tiny part of a much broader range of light energy. Many of these other portions of the spectrum get totally or partially blocked by earth's atmosphere, requiring telescopes to be flown in space if we are to observe objects at these wavelengths. There are no hard boundaries or breaks in this distribution of light energy, although for convenience we assign names to various sections, as shown in the diagram above.

Ultraviolet light picks up at the blue end of the optical portion of the spectrum and continues to shorter wavelengths, eventually blending into the X-ray range. HUT's distinction is that it can operate farther into the ultraviolet (that is, to shorter wavelengths of light) than other space-borne telescopes such as the Hubble Space Telescope, a spectral range that contains much new and exciting information about the objects being observed.

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