WASP-39b is an exoplanet located about 319 light-years away from Earth in the constellation Virgo. It is classified as a gas giant, similar in size to Saturn, and orbits its host star, WASP-39, every 4 days. This planet is notable for its atmosphere, which has been studied using data from the Hubble Space Telescope and the James Webb Space Telescope. Observations have revealed the presence of various molecules, including water vapor, making it a key target for understanding planetary atmospheres beyond our solar system.