Webb has twice hinted at dimethyl sulfide, a life-linked gas, at the possible ocean world K2-18b. Independent teams re-examining the data doubt the molecule is there at all.
A planet called K2-18b, 124 light-years away in the constellation Leo, has become the most closely watched world in the search for life beyond the solar system. It may be a hycean world, a body wrapped in a thick hydrogen-rich atmosphere over a globa... [5255 chars]