Moons around Jupiter
Date: 9 Jan 2007
The New Horizons Long Range Reconnaissance Imager (LORRI) took this photo of Jupiter and two of its moons, Ganymede (right) and Io (left).
Ganymede's average orbit distance from Jupiter is about one million kilometers (620,000 miles); Io's is 422,000 km (262,000 miles). Both Io and Ganymede are larger than Earth's moon; Ganymede is larger than the planet Mercury.
Last Update: 7 Dec 2011 (AMB)
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute