The NASA/ESA Hubble Space Telescope has completed its annual grand tour of the outer Solar System. This is the realm of the giant planets — Jupiter, Saturn, Uranus, and Neptune — extending as far as 30 times the distance between Earth and the Sun. (Image: A. Simon (Goddard Space Flight Center), and M.H. Wong (University of California, Berkeley) and the OPAL team via NASA, ESA)
