That part of the electromagnetic spectrum lying between the far infrared and microwave region, corresponding to wavelengths between about 300 microns and 1 mm. The submillimeter band is particularly important in astronomy for making observations of objects which are are useful for finding out more about the early universe. Most of this astronomically important radiation is blocked by the Earth's atmosphere, so to combat this instruments must be placed on the ground at high altitude or in space.
Related category OBSERVATIONAL ASTRONOMY
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