Barnard b circles Barnard’s Star, one of the closest at 6 light-years, with an estimated radius around 0.9 × Earth. Its tight 3.2-day orbit lies well inside the habitable zone, resulting in high temperatures. As a sub-Earth in our cosmic backyard, it highlights rocky planet diversity around fast-moving dwarfs. This entry endures in the Galactic Codex, underscoring the challenges and wonders of nearby stellar systems.
