Picture of the Day - Jupiter and it's moon Io

The Galilean satellite Io floats above the cloudtops 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.

Jupiter and it's moon Io. Credit: NASA/JPL/University of Arizona

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 very big.