Dimethyl sulfide

Methane breaks down rapidly in an atmosphere, so finding it paired with carbon dioxide strongly suggests a continuous biological engine like methanogenic organisms.

What about DMS or dimethyl sulfide? On Earth, dimethyl sulfide and its cousin, DMDS, are produced exclusively by biological processes, primarily by marine phytoplankton in our oceans, so finding DMS in space would be massive.

Which brings us to two of the most fascinating exoplanet targets JWST has examined so far.

And these are K2-1ab and TRAPPIST-1.