Back to today’s briefing

Story perspectives

JWST Identifies GJ 3929b as Bare Rock, Lacks Atmosphere

8/23/2025

23 2

Summary

Story summary

The James Webb Space Telescope (JWST) identified exoplanet GJ 3929b as lacking a significant atmosphere, categorizing it as a "bare rock."
Discovered in 2022, GJ 3929b was initially considered Earth-like but does not have a CO2-rich atmosphere.
This data is crucial for understanding atmospheric retention and planetary evolution.
Future JWST observations will further investigate these processes.

1 of 1

Story summary

The James Webb Space Telescope (JWST) identified exoplanet GJ 3929b as lacking a significant atmosphere, categorizing it as a "bare rock."
Discovered in 2022, GJ 3929b was initially considered Earth-like but does not have a CO2-rich atmosphere.
This data is crucial for understanding atmospheric retention and planetary evolution.
Future JWST observations will further investigate these processes.