Bruce Murray Space Image Library
Every round object in the solar system under 10,000 kilometers in diameter, to scale (2014 version, update available)
This graphic has been updated. A version including Pluto, Charon, and Ceres is available here.
Estimated sizes for Kuiper belt objects from Mike Brown's "How many dwarf planets are there in the outer solar system?" page, retrieved on March 5, 2014.