James Webb telescope discovers ancient 'water world'

Astronomers have finally peered past the clouds on the exoplanet GJ 1214b, a mini-Neptune planet around a star about 40 light-years away

- BRILEY LEWIS

Mini-Neptunes, like a shrunken-down version of the familiar gas giant, are a common type of planet in our galaxy, but because there isn’t one in our own Solar System, these worlds have largely remained a curiosity for scientists.

Previous observations of the distant planet were foiled by thick cloud layers, but the powerful James Webb Space Telescope’s (JWST) infrared heat vision allowed astronomers to find a new view through the haze. The results reveal that GJ 1214b has an atmosphere made of steam, hinting at its past as a possible ‘water world’.