Wavelength diagram showing a blue line going up and down and then up again

Radio waves, television waves and microwaves have different wavelengths. Image Credit: NASA

      the distance between one peak or crest of a wave of light, heat, or other energy and the next peak or crest

NASA's satellites study different wavelengths of light from space.

Wavelengths can look like waves in the ocean; and just like in the ocean, some are small and others are huge.

More Information:
http://science.hq.nasa.gov/kids/imagers/ems/ems.html   →
http://science.hq.nasa.gov/kids/imagers/ems/waves3.html   →