(infrared radiation with wavelengths in the 30-450 μm range)
Far infrared is electromagnetic radiation
at the opposite end of infrared from visible light.
The term is not consistently used, but often taken as EMR
with a wavelength between 15 μm and 1 mm.
In astronomy (far-infrared astronomy),
the term is typically used for the wavelength range is 30-450 μm.
It can indicate cold clouds of gas and dust,
cold matter of 140 kelvins or less.
The term submillimeter astronomy covers the range from 450 μm to 1 mm
and perhaps sometimes is used to cover far infrared astronomy as well.
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Referenced by pages:
ionized carbon fine structure line ([CII])
Cosmic Background Explorer (COBE)
Fabry-Pérot interferometer (FPI)
Herschel Space Observatory
hyperluminous infrared galaxy (HLIRG)
James Clerk Maxwell Telescope (JCMT)
luminous infrared galaxy (LIRG)
multichroic feedhorn array
Submillimeter Telescope (SMT)
ultraluminous infrared galaxy (ULIRG)