The Electromagnetic Spectrum is the entire range of electromagnetic radiation, from radio waves to gamma waves. Scientists use the Electromagnetic Spectrum to find distant galaxies in space, to take pictures of people's skeletal structure, or to make technology like radios, microwaves, and remote controls.

Waves with less frequency have longer wavelengths while waves with higher frequency have shorter wavelengths. Wavelengths are related to energy in the way that the wavelength gets shorter as you go up the electromagnetic spectrum. Waves that have less energy are longer while waves that have more energy are shorter.