(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:
Fred Young Submillimeter Telescope (FYST)
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
Origins Space Telescope (OST)
Submillimeter Telescope (SMT)
ultraluminous infrared galaxy (ULIRG)