structures from Mars: I'm not sure that a geological origin was discarded. Wait 5 years until the dust settle. Phosphine gas on Venus: I think it was debunked.

structures from Mars: I'm not sure that a geological origin was discarded. Wait 5 years until the dust settle. Phosphine gas on Venus: I think it was debunked. now organic molecules on Enceladus: And there is plenty of organic molecules in Titan, but they are created by inorganic reactions. Something like https://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment https://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment at a moon scale. (Note that the modern versions use a very different gas mix, but the end result is similar.)