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PHOTO CAPTION                                     August 13, 1996        
                                                  Dark Bands on Europa
                                                  P-47183 bw

Dark crisscrossing bands on Jupiter's moon Europa represent
widespread disruption from fracturing and the possible eruption
of gases and rocky material from the moon's interior in this
four-frame mosaic of images from NASA's Galileo spacecraft. These
and other features suggest that soft ice or liquid water was present
below the ice crust at the time of disruption. The data do not rule
out the possibility that such conditions exist on Europa today. The
pictures were taken from a distance of 156,000 kilometers (about
96,300 miles) on June 27, 1996. Many of the dark bands are more than
1,600 kilometers (1,000 miles) long, exceeding the length of the San
Andreas fault of California. Some of the features seen on the mosaic
resulted from meteoritic impact, including a 30-kilometer (18.5 mile)
diameter crater visible as a bright scar in the lower third of the
picture. In addition, dozens of shallow craters seen in some terrains
along the sunset terminator zone (upper right shadowed area of the
image) are probably impact craters. Other areas along the terminator
lack craters, indicating relatively youthful surfaces, suggestive of
recent eruptions of icy slush from the interior. The lower quarter of
the mosaic includes highly fractured terrain where the icy crust
has been broken into slabs as large as 30 kilometers (18.5 miles) across.

The mosaic covers a large part of the northern hemisphere and includes
the north pole at the top of the image. The sun illuminates the surface
from the left. The area shown is centered on 20 degrees north latitude
and 220 degrees west longitude and is about as wide as the United States west
of the Mississippi River.

The Galileo mission is managed by NASA's Jet Propulsion Laboratory.