Unpacking the Electromagnetic Spectrum
When you tune your radio, watch TV, send a text message, or pop popcorn in a microwave oven, you are using electromagnetic energy. You depend on this energy every hour of every day. Without it, the world you know would not exist. Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays. The human eye can only detect only a small portion of this spectrum called visible light. A radio detects a different portion of the spectrum, and an x-ray machine uses yet another portion. NASA's scientific instruments use the full range of the electromagnetic spectrum to study the Earth, the solar system, and the universe beyond.
Read more about the electromagnetic spectrum athttp://missionscience.nasa.gov/ems/01_intro.html
Read more about the electromagnetic spectrum from Earthsky athttp://earthsky.org/space/what-is-the-electromagnetic-spectrum
Read about false-color satellite imagery athttp://earthobservatory.nasa.gov/Features/FalseColor/?src=googleplus