Science Mission Directorate. "Introduction to the Electromagnetic Spectrum." Mission:Science. National Aeronautics and Space Administration, 2010. Web. 30 Jan. 2013. <http://missionscience. nasa.gov/ems/01_intro.html>
What is the electromagnetic spectrum?
I know it’s a big word, but the electromagnetic spectrum simply means the various types of electromagnetic radiation based on their wavelengths. This spectrum is divided into different categories: radio waves, microwaves, infrared waves, visible light waves, ultraviolet waves, x-rays, and gamma rays.