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James Webb Reveals Secrets of Scorching Exoplanet TOI-421b

5/10/2025

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Summary

Story summary

The James Webb Space Telescope has unveiled fascinating details about TOI-421b, a scorching sub-Neptune circling a G-type star. Its hydrogen-rich atmosphere sets it apart from cooler counterparts, shedding light on the mysterious "radius gap" in exoplanets. This discovery hints at a unique formation process, allowing TOI-421b to preserve its primordial atmosphere.

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Story summary

The James Webb Space Telescope has unveiled fascinating details about TOI-421b, a scorching sub-Neptune circling a G-type star. Its hydrogen-rich atmosphere sets it apart from cooler counterparts, shedding light on the mysterious "radius gap" in exoplanets. This discovery hints at a unique formation process, allowing TOI-421b to preserve its primordial atmosphere.