A Canadian-led international study using the James Webb Space Telescope has uncovered significant insights into the atmosphere of GJ 9827 d, an exoplanet located about 98 light-years away in the constellation Pisces. Led by Caroline Piaulet-Ghorayeb from Université de Montréal, the research revealed that the planet's atmosphere contains a substantial amount of heavier molecules, including a notable presence of water vapor, suggesting it could be classified as a 'steam world.' This discovery challenges conventional knowledge as most exoplanets with atmospheres are hydrogen-dominated gas giants. The study's findings pave the way for exploring habitable environments beyond our Solar System and enhancing our understanding of planetary compositions. By utilizing the James Webb Space Telescope and Hubble Space Telescope data, researchers were able to confirm the unique atmospheric composition of GJ 9827 d, which differs from the typical hydrogen-dominated atmospheres of larger planets. Although the exoplanet is not deemed habitable due to its high surface temperatures, its heavy, water-rich atmosphere showcases the potential for studying Earth-like planets in the future. The research signifies a significant progression in exoplanet studies, offering hope for the discovery of habitable exoplanets and further understanding of planetary atmospheres.