HD 20003 is a Sun-like G-type star (about 0.88 solar masses, 5,494 K), 41.8 light-years from Earth. HD 20003 b is a 11.7-Earth-mass planet, with an orbital period of 11.8 days, at 0.097 AU from its star, on an eccentric orbit (e ≈ 0.36), discovered in 2019 via radial velocity. HD 20003 c is a 14.4-Earth-mass planet, with an orbital period of 33.9 days, at 0.196 AU from its star, on an eccentric orbit (e ≈ 0.10), discovered in 2019 via radial velocity. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly.