These are the eight bodies in the solar system that are between 2,500 and 5,300 kilometers in diameter: Mercury (4,879 kilometers), the Moon (3,475), Io (3,639), Europa (3,125), Ganymede (5,265), Callisto (4,819), Titan (5,150, but it appears 5,550 with its atmosphere), and Triton (2,706). The next biggest body is much larger Mars, at 6,794 kilometers, and much smaller Titania, at 1,578.

All images NASA / JPL / Ted Stryk except the Moon (Alfredo Balreira) and Titan (NASA / JPL / SSI / Emily Lakdawalla). Montage by Emily Lakdawalla.