Discover how ice crystals and winter skies create sundogs, sun pillars and halos — and when to look up from the Nature Center ...

How can we measure visible light? The electromagnetic spectrum includes all forms of light energy, known as electromagnetic radiation. (1) Different types of electromagnetic radiation such as radio ...

There is a limited portion of the electromagnetic spectrum that we humans are able to see as different colors of visible light. Our most important source of energy is the sun and sunlight includes the ...

Researchers have created visible lasers of very pure colors from near-ultraviolet to near-infrared that fit on a fingertip. The colors of the lasers can be precisely tuned and extremely fast -- up to ...