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  1. An Update on the Chinese Space Station Telescope Project Hu Zhan, National Astronomical Observatories, CAS, KIAA, Peking University, On behalf of the CSST Team, ISSI-BJ Workshop: Weak gravitational lensing studies from space missions, Beijing, 2019.11.05
  2. The Chinese Survey Space Telescope (a.k.a. the Chinese Space Station Telescope), Hu Zhan, NAOC & PKU, UV Club, Caltech 2021.09.22

In the 2nd link on slide 7 in the table of specifications:

Wavelength 0.255-1 μm, 0.9-1.7 μm, 0.41-0.51 THz

Near-Terahertz radio astronomy is a regular thing, ALMA's band 10 goes up to 0.95 THz for example

and the famous images "of" supermassive black holes (M78* and Sgr A*) were made at about 0.23 THz. The Xuntian space telescope's range is between these.

And I think the Sofia measurements were at about 2 THz:

Question: How will China's Xuntian (the Chinese Survey Space Telescope) use its Terahertz capability? THz Spectroscopy? Imaging? Something else?

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    $\begingroup$ in meta: What is the best way to tag questions about Xuntian, the Chinese Survey Space Telescope? $\endgroup$
    – uhoh
    Commented Mar 4, 2023 at 4:11
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    $\begingroup$ There's a brief description of the THz instrument on slide 22 of the second link; it appears to be devoted to spectroscopy. $\endgroup$
    – Peter Erwin
    Commented Mar 4, 2023 at 11:41
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    $\begingroup$ @PeterErwin I guess it would be hard to imagine a radio receiver not having spectroscopic capability (unless it's a bolometer) but can we find out if it's sort-of the equivalent of a single slit spectrometer, or more of imaging system (like the array of antennas described in the linked Sofia question or this)? $\endgroup$
    – uhoh
    Commented Mar 4, 2023 at 13:15

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