The Cosmic Forge: Why GJ 3929 b Lost Its Air
Red dwarfs are tireless blacksmiths of planetary fate. Their radiation, like a hammer, beats off gas envelopes, leaving only naked rocky cores.
In the depths of the constellation Hercules, around the dim M-dwarf GJ 3929, orbits a world one-and-a-half times Earth's size, like a billet on an anvil.