Using the NASA/ESA Hubble Space Telescope, astronomers have detected a stratosphere – an atmospheric region that is very important to life – on a massive and hot exoplanet called WASP-33b. This is an artist’s concept of a hot Jupiter exoplanet. Image credit: NASA / ESA / G. Bacon, STScI. The presence of a stratosphere can provide clues about the composition of a planet and how it formed. This atmospheric layer occurs when molecules in...