Purple is a combination of wavelengths from opposite extremes of the spectrum, which technically deosn’t make any sense, but our brains evolved a solution. When we “see” a combination of blue and red ...

Light isn’t exactly a wave in the conventional sense, but it behaves like one, and it has a wavelength. Ultraviolet light has a short wavelength, which means it has a high frequency, and ...

The NASA New Horizons spacecraft's extensive observations of Lyman-alpha emissions have resulted in the first-ever map from the galaxy at this important ultraviolet wavelength, providing a new look at ...

The NASA New Horizons spacecraft’s extensive observations of Lyman-alpha emissions have resulted in the first-ever map from ...

The realization of compact and reliable diode-pumped solid-state lasers that emit UV light is now opening the ... lasers emitting UV wavelengths has grown in the past couple of years, both for ...

You then stand in a cabinet which shines ultraviolet light on to your skin. This page is about PUVA. The sun produces a number of different ultraviolet UV rays, each with their own wavelength.

In fact, violet (along with the rest of the colors in a naturally occurring rainbow) has something purple doesn’t—its own wavelength of light. Anyone who ever ended up with a sunburn knows ...