1.3mm Observation of Electromagnetic Radiation is useful for detecting how much cold
Dust is somewhere.
The thermal continuum of cold dust produces considerable
1.3mm signal with few enough other sources to make it useful when looking
at dust clouds and planetary disks. Dust is optically thin at this
Wavelength so the signal corresponds to the mass of the dust cloud.
Submillimeter Array and other similar telescopes image and
Survey at this wavelength.
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