This image of Europa, an icy satellite of Jupiter, was obtained from a range of
39028 miles (62089 kilometers) by the Galileo spacecraft during its fourth orbit
around Jupiter and its first close pass of Europa. The image spans an area
157 miles by 244 miles (252 km by 393 km), and shows features as small as
a mile (1.6 km) across. Sun illumination is from the right, revealing several
ridges crossing the scene, plateaus commonly several miles (10 km) across,
and patches of smooth, low-lying darker materials. No prominent impact craters
are visible, indicating the surface in this location is not geologically ancient.
Some ridges have gaps, and subtle textural differences in these areas indicate
that missing ridge segments probably were swept away by volcanic flows. The
flow deposits are probably composed mainly of water ice, the chief constituent
of the surface of Europa.
The Galileo mission is managed by the Jet Propulsion Laboratory for NASA's
Office of Space Science, Washington, D.C.
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://galileo.jpl.nasa.gov/. Background information and educational
context for the images can be found at http://www2.jpl.nasa.gov/galileo/sepo/.
