invisible rays

• ultravioletWavelengths shorter than violet
• infraredHeat-bearing electromagnetic waves
• radiationEnergy propagation through space
• wavelengthSpatial repetition interval
• spectrumContinuous range of values

X-rays · gamma · microwave · electromagnetic · unseen · penetrating · sunburn · thermal · detection · frequency · photons · energy · heat · stealth · hidden · cosmic · UV · radiant