We've finally got our first optical look at an exoplanet and its atmosphere, and boy is it a strange place. The planet is called HR8799e, and its atmosphere is a complex one. HR8799e is in the grips of a global storm, dominated by swirling clouds of iron and silicates.
Thanks to the Kepler spacecraft, we've discovered a lot of exoplanets and exoplanet candidates in the last few years. In fact, it's almost routine now. But we don't know enough about them. We can determine a mass range for them and also their likely composition and density, but their atmospheric characteristics are hidden from us.
But that is starting to change.