The New Horizons Long Range Reconnaissance Imager (LORRI) took this
photo of Jupiter at 20:42:01 UTC on January 9, 2007, when the spacecraft
was 80 million kilometers (49.6 million miles) from the giant planet. The volcanic
moon Io is to the left of the planet; the shadow of the icy moon Ganymede moves
across Jupiter's northern hemisphere.
Ganymede's average orbit distance from Jupiter is about 1 million kilometers
(620,000 miles); Io's is 422,000 kilometers (262,000 miles). Both Io and
Ganymede are larger than Earth's moon; Ganymede is larger than the planet
Mercury.