a graph where the x axis is wavelength of light and the y axis is the amount of light by the star blocked by the exoplanet atmosphere NASA, ESA, CSA, and STScI NASA's Webb Telescope has captured the distinct signature of water, along with evidence for clouds and haze, in the atmosphere surrounding a hot, puffy gas giant planet orbiting a distant sun-like star. The observation, which reveals the presence of specific gas molecules based on tiny decreases in the brightness of precise colors of light, is the most detailed of its kind to date, demonstrating Webb’s unprecedented ability to analyze atmospheres hundreds of light-years away.