See more photos under the hashtag dedosmorados (purple fingers)

Solar radiation is energy in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths.

For two years, I searched for a fiber that could survive ultraviolet rays, salt, air, pollution, and at the same time remain soft enough to move fluidly in the wind.

If we had UV eyes or X ray eyes, we would really see the dynamic and dramatic effects of our Sun's magnetic activity the kind of thing that happens on other stars as well.

As the temperature increases, the peak shifts to shorter wavelengths, producing first a red glow, then a white one, and finally a blue white colour as the peak moves out of the visible part of the spectrum and into the ultraviolet.

Within about 20 minutes of ultraviolet exposure in light skinned individuals (three to six times longer for pigmented skin), the concentrations of vitamin D precursors produced in the skin reach an equilibrium, and any further vitamin D produced is degraded.

Photonics is the science of generating, controlling, and detecting photons (packets of light), particularly in the visible and near Infrared, but also extending to the Ultraviolet, Infrared and far IR portions of the electromagnetic spectrum.

I think there's something poetic here, that these pictures taken with ultraviolet filter, the main use of that filter is for astronomers to take pictures of Venus actually the clouds of Venus.

In this visually dazzling talk, Jonathan Drori shows the extraordinary ways flowering plants over a quarter million species have evolved to attract insects to spread their pollen growing 'landing strips' to guide the insects in, shining in ultraviolet, building elaborate traps, and even mimicking other insects in heat.