 So that's Guangwei Fu, and he's the lead author of the study that just published in Nature. And he and his team studied this planet's atmosphere using light from the star it's orbiting, memorably named HD 189733. And so we're looking at the star's light as it's passing through the planet's atmosphere. And that can tell us what the atmosphere is made out of because different particles block different wavelengths of light. And here they could tell that carbon dioxide, water, and our smelly friend hydrogen sulfide are blocking some light.