Webb finds molecule only made by living things in another world

James Webb Space Telescope detected dimethyl sulfide in K2-18 b, an exoplanet 120 light-years away.

This molecule is produced by phytoplankton, microscopic plant-like organisms in salty seas as well as freshwater.

Discovery bolsters previous work suggesting the distant world has a hydrogen-rich atmosphere hanging over an ocean.

But scientists caution that the evidence supporting the presence of the molecule is tenuous.