Barnard's star is a cool M-dwarf (about 0.16 solar masses, 3,195 K, 0.18 solar radii), 6 light-years from Earth. Barnard's Star is the nearest single star to the Sun, and its low-mass planets are among the closest exoplanets known. Barnard d is a 0.3-Earth-mass planet, with an orbital period of 2.3 days, at 0.019 AU from its star, and an equilibrium temperature near 483 K, discovered in 2025 via radial velocity. Barnard b is a 0.3-Earth-mass planet, with an orbital period of 3.2 days, at 0.023 AU from its star, and an equilibrium temperature near 438 K, discovered in 2024 via radial velocity. With 4 confirmed worlds, Barnard's star is a densely packed system whose resonances, spacing, and formation history are active research topics.