Submillimetre astronomy

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What Wikipedia says

Submillimetre astronomy or submillimeter astronomy (see spelling differences) is the branch of observational astronomy that is conducted at submillimetre wavelengths (i.e., terahertz radiation) of the electromagnetic spectrum.

Excerpt from the Wikipedia article “Submillimetre astronomy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Samuel Bouchard from Quebec City, Canada; modified by User:Huntster, CC BY-SA 2.0, via Wikimedia Commons.