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Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz)[1] (although people can see infrared up to at least 1050 nm in experiments[2][3][4][5]). Most of the thermal radiation emitted by objects near room temperature is infrared.
Infrared radiation was discovered in 1800 by astronomer Sir William Herschel, who discovered a type of invisible radiation in the spectrum beyond red light, by means of its effect upon a thermometer.[6] Thomson]], 1864: 219
Type species: Gnomidolon biarcuatum (White, 1855), by original designation, (Thomson, 1864: 219).
Gnomidolon [[James Thomson|
Electromagnetic spectrum, Maxwell's equations, Electromagnetism, Light, Frequency
Color, Watt, Electromagnetic spectrum, Rainbow, Metre
Star, Variable star, Hubble Space Telescope, Infrared, Galaxies
Infrared, Metamaterial, Electromagnetic radiation, Terahertz, Split-ring resonator
Infrared, Gamma ray, Color, Radio, Energy