Electromagnetic Spectrum

Electromagnetic Spectrum , a science documentary explaning forms of lightThe visible light that we see is just a small part of the actual light emitted throughout the universe. Through the combination of electrical and magnetic fields, light energy is produced. Nothing in the universe moves faster than the speed of light, which is 186,000 miles per second, or 670,000,000 miles per hour. Light travels in different wavelengths. The portion of light we see, referred to as visible light, shows up as the colors of the rainbow. These are red, orange, yellow, green, blue, indigo and violet. The other types of light in the spectrum, or the invisible light, are radio, microwave, infrared, ultraviolet, x-ray, and gamma ray. In this order, radio waves have the longest wavelength, while gamma rays have the shortest.Since all matter emits light, we can use infrared telescopes to see stars and dust in space that we would otherwise be unable to see. And by viewing the color of the star, we can gauge its distance and its temperature.