Mini-Neptunes likely have hard surfaces, not magma oceans: James Webb telescope reveals

09 Nov 2025 | Category: Science

A new study using data from NASA's James Webb Space Telescope (JWST) has overturned long-held beliefs about mini-Neptune exoplanets. Earlier, scientists assumed these planets—smaller than Neptune but wrapped in thick hydrogen-helium atmospheres—were covered in global magma oceans.

New Delhi:
The mini-Neptunes are planets with a radius less than that of Neptune yet larger than Earth, owing to their dense hydrogen-helium atmospheres. They are believed to be the most abundant kind of planet based on the exoplanet discoveries by N...

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