has been a known astromolecule for over three decades, with a pair of initial
interstellar detections reported in the early 1970s
Penzias et al. and
Zuckerman et al.,
followed by identification in two extragalatic sources,
Henkel & Bally in 1985.
It was also observed in
comet West with UV spectroscopy by
Smith et al.
Less common isotopic variations (13C32S,12C34S) have also been
CS is plentiful enough to use as a tracer of structure and temperature of dense clouds (
Taylor et al.,
Wu & Evans) as well as star-forming regions
(Zinchenko et al.).
CS is a periodically related cousin of the most common carbon-bearing astromolecule,
carbon monoxide (CO), though CS is