Io, the most volcanic body in the solar system, is
seen in front of Jupiter's cloudy atmosphere in this image from NASA's
Galileo spacecraft, now orbiting the giant planet. This newly processed
image is the best and highest resolution view of Io produced thus far by
Galileo. Galileo was about 487,000 kilometers (about 302,000 miles) from
Io when this was taken on September 7, 1996, and Jupiter was about
908,000 kilometers (about 564,000 miles) away. The image is centered on
the side of Io that always faces away from Jupiter. The color in the
image is composed of data taken in the near-infrared, green and violet
filters of Galileo's solid-state imaging camera, and has been enhanced to
emphasize the extraordinary variations in color and brightness that
characterize Io's volcano-pocked face. The black and bright red materials
correspond to the most recent volcanic deposits, probably no more than a
few years old. The near-infrared filter makes Jupiter's atmosphere look
blue. The active volcano Prometheus is seen near the right-center of the
disk. Scientists are noting many changes that have occurred on Io's
surface since the Voyager flybys 17 years ago, and even a few changes in
the two months since Galileo's imaging of Io this summer. The Jet
Propulsion Laboratory, Pasadena, CA, manages the mission for NASA's
Office of Space Science, Washington , DC. This image and other images and
data received from Galileo are posted on the Galileo mission home page on
the World Wide Web at http://www.jpl.nasa.gov/galileo. Background
information and educational context for the images can be found at http://
www.jpl.nasa.gov/galileo/sepo
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