NASA's James Webb telescope detects water on distant planet

Webb's immediate and more detailed observation marks a giant leap forward in the quest to characterise potentially habitable planets beyond Earth

NASA's James Webb Space Telescope has detected signs of water, along with evidence for clouds and haze, in the atmosphere of a hot, puffy gas giant planet orbiting a Sun-like star over a thousand light years away, the U.S. space agency said on July 13.

The observation is the most detailed of its kind to date, demonstrating Webb's unprecedented ability to analyse distant atmospheres, according to NASA. WASP-96 b is one of more than 5,000 confirmed exoplanets in the Milky Way.

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Located roughly 1,150 light-years away in the southern-sky constellation Phoenix, it represents a type of gas giant that has no direct analogue in our solar system, it said in a statement.

With a mass less than half that of Jupiter and a diameter 1.2 times greater, WASP-96 b is much puffier than any planet orbiting our Sun. With a temperature greater than 538 degrees Celsius, it is significantly hotter.

WASP-96 b orbits extremely close to its Sun-like star, just one-ninth of the distance between Mercury and the Sun, completing one circuit every three-and-a-half Earth-days, according to NASA.

The combination of large size, short orbital period, puffy atmosphere, and lack of contaminating light from objects nearby in the sky makes WASP-96 b an ideal target for atmospheric observations.