There is research saying that such unknown phosphine generation is not a simple explanation at all. e.g. http://www.sci-news.com/astronomy/phosphine-biosignatu

There is research saying that such unknown phosphine generation is not a simple explanation at all. e.g. http://www.sci-news.com/astronomy/phosphine-biosignature-gas-07957.html http://www.sci-news.com/astronomy/phosphine-biosignature-gas... >The scientists found that phosphine has no significant false positives, meaning any detection of phosphine is a sure sign of life.