far infrared

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The longer wavelengths of the infrared part of the electromagnetic spectrum. Although ill-defined, the far infrared is generally taken to cover wavelengths of about 35–300 μm, which are blocked by the Earth's atmosphere. The region between 300 μm and 1 mm, which is accessible from high mountain observatories, is now often referred to as the submillimetre band.

Subjects: Astronomy and Astrophysics.

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