Another Earth-like exoplanet crossed off the list: JWST shows that GJ 3929b has no atmosphere
https://phys.org/news/2025-08-earth-exoplanet-jwst-gj-3929b.html
Another Earth-like exoplanet crossed off the list: JWST shows that GJ 3929b has no atmosphere
https://phys.org/news/2025-08-earth-exoplanet-jwst-gj-3929b.html
2 Comments
Quite odd composition to have with ~ 0.43 Earth masses and ~1.15 Earth radii.
Maybe the system is lacking iron/nickel and no core developed to protect the atmosphere with a magnetic shield?
[Here’s the original story as published by Universe Today](https://www.universetoday.com/articles/another-earth-like-exoplanet-crossed-off-the-list-the-jwst-shows-that-gj-3929b-has-no-atmosphere).
It’s the same article and same images/video, but with no ads/tracking/etc. It loads very quick (blink and you miss it). There’s a dark mode and a little author’s blurb that phys.org doesn’t have.
Phys.org is a content aggregator. They compile free (like this) and licensed content and republish it with their own ads/tracking/whatever. The original article is usually a better browsing experience, especially when it comes from Universe Today.