It was discovered in 1800 by William Herschel (1738 -1822)
in the sun's spectrum.
having a wavelength in the range of 750 to 1,000,000
nanometers, thus occupying that part of the electromagnetic
spectrum with a frequency less than that of red visible
Light and greater than that of Microwaves.
radiation is thermal, or heat, radiation, and is produced
by any body having a temperature above absolute zero.
It has many of the same properties as visible light,
such as being reflected or refracted.