From NASA's Planetary Photojournal
The Galilean satellite Io floats above the cloud tops of Jupiter in this image captured on the dawn of the new millennium, January 1, 2001 10:00 UTC (spacecraft time), two days after Cassini's closest approach. The image is deceiving: there are 350,000 kilometers -- roughly 2.5 Jupiters -- between Io and Jupiter's clouds. Io is the size of our Moon, and Jupiter is much bigger.
Image Title: A New Year for Jupiter and Io
Catalog #: PIA02879
Photo Target Name: Jupiter/Io
Image Credit: NASA/JPL/University of Arizona
Spacecraft/Mission: Cassini Orbiter
Last Modified On: Wednesday, February 28, 2001