What's in the Atmosphere of a Planet?

Every molecule and chemical emits different finger prints. This is how, for example, we saw evidence of phosphine in the atmosphere of venus. And now, because of james webb, we can start to play these kinds of games for all sorts of ex planets, ones that are even closer. You know, we're looking at a cloudy day on wasp 96 b. That's amazing weather forecasting for us, for space. But i guess the idea is that light changes when it goes through water vapor,. And you can see those changes here, yes.