(Photo : ESA/Hubble, M. Kornmesser) Using this approach, an international team of astronomers headed by a researcher from Queen's University Belfast's Astrobiology Center used the Subaru telescope to look for chemical signatures in WASP-33b's atmosphere. They discovered hydroxyl, a one-oxygen, one-hydrogen atom molecule (abbreviated as OH). If it reacts with water vapor and carbon monoxide, hydroxyl is expected to play a significant role in the chemical composition of WASP-33b's atmosphere. Dr. Stevanus Nugroho, the lead researcher at Queen's University Belfast, said, "This is the first time OH has been found in the atmosphere of a world outside of our Solar System. It demonstrates that astronomers can not only find this molecule in exoplanet atmospheres but also that they can begin to comprehend the composition of this planetary population in greater detail."