GJ 667 C is a cool M-dwarf (about 0.33 solar masses, 3,350 K), 7.2 light-years from Earth. The system hosts 5 confirmed planets on orbits ranging from 28.1 days to 7.2 days. With 5 confirmed worlds, GJ 667 C 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. GJ 667 C c orbits well inside Earth's distance from the Sun. Its low mass makes GJ 667 C c a Neptune- or super-Earth-class world rather than a gas giant.