Kepler-48 is an orange K-type dwarf (about 0.88 solar masses, 5,194 K, 0.89 solar radii), 307 light-years from Earth. The system hosts 5 confirmed planets on orbits ranging from 4.8 days to 2.69 years. With 5 confirmed worlds, Kepler-48 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. At 1.9 Earth radii, Kepler-48 b is a compact world comparable in size to rocky planets in our Solar System.