(observation frequency useful for detecting dust)
1.3-mm observation of electromagnetic radiation is useful for detecting how much cold
dust is somewhere.
The black-body radiation of cold dust produces considerable
1.3-mm signal with few enough other sources to make it useful when looking
at dust clouds and protoplanetary disks.
Dust is optically thin at this
wavelength so the signal corresponds to the mass of the dust cloud.
The Submillimeter Array (SMA) and other similar telescopes image and
survey at this wavelength.
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