HD 10180 is a Sun-like G-type star (about 1.06 solar masses, 5,911 K, 1.11 solar radii), 39.0 light-years from Earth. HD 10180 is one of the richest planetary systems found by radial velocity, with at least six planets packed around a quiet Sun-like star. The system hosts 6 confirmed planets on orbits ranging from 5.8 days to 6.04 years. With 6 confirmed worlds, HD 10180 is a densely packed system whose resonances, spacing, and formation history are active research topics. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly. HD 10180 c orbits well inside Earth's distance from the Sun. Its low mass makes HD 10180 c a Neptune- or super-Earth-class world rather than a gas giant.