TOI-4507 b orbits a youthful star 578 light-years distant, a remarkably low-density Neptune-like world with a radius of 9.0 × Earth yet only modest mass. Its puffed-up envelope results from intense internal heating or formation processes in a young system. Orbiting at a moderate distance, it challenges models of planetary inflation and stability. This enigmatic super-puff endures in the Galactic Codex as a bold exception to standard rules, highlighting the wild diversity of gaseous worlds and the surprises awaiting in distant stellar nurseries.
