Methane as a key bio-signature:
phys.org
If a planet has a lot of methane in its atmosphere, life is the most likely cause
The ultra-powerful James Webb Space Telescope will launch soon. Once it's deployed and in position at the Earth-Sun Lagrange Point 2, it'll begin work. One of its jobs is to examine the atmospheres of exoplanets and look for biosignatures. It should be simple, right? Just scan the atmosphere...
