GJ 367 b transits a nearby red dwarf M-type star 31 light-years away, with a radius of 0.9 × Earth and high density suggesting an iron core. It orbits every 0.32 days at a scorching close distance, far inside the habitable zone. As an ultra-short-period sub-Earth, it reveals extreme planetary stripping processes. This compact beacon in the Galactic Codex illuminates the harsh realities of close-in worlds around faint stars, contrasting with more temperate realms.
