The Digital Press

New observations from the James Webb Space Telescope suggest that the exoplanet GJ 3929b is likely a bare rocky world without a significant atmosphere.

Why it matters: This finding helps understand atmospheric loss and composition of small, rocky exoplanets orbiting close to their stars.

The big picture: GJ 3929b's dayside temperature matches a bare rock model, indicating no thick CO2 atmosphere and no heat redistribution.

Stunning stat: JWST measured secondary eclipse depths around 150 ppm, implying a dayside temperature near 782 K consistent with a black rock.

Commenters say: Readers highlight excitement about JWST's precision, implications for rocky exoplanet atmospheres, and curiosity about the system's additional planets.