The latest images from NASA's Galileo spacecraft providing insights into the possibility of a Europan ocean and the volcanism of Io. This area is highly unusual compared to many other areas on Europa because of its high concentration of fresh-appearing bright ridges and fractures. On Earth it runs through Greenwich in London. Lava flows similar to those found in Hawaii are seen in the black and white image at top, taken by NASA's Galileo spacecraft. The two horizontal black stripes are places where data were lost during transmission to Earth.
Calderas are depressions caused by collapse during volcanic eruptions.
The lava flows are similar in texture to lava flows within the caldera at Hawaii's Kilauea volcano. This suggests that the floor of Chaac has been covered by a combination of lava flows and lava lakes. Obtained 3 July 1999 and 22 February 2000 Volcanic calderas, lava flows and cliffs are seen in this false color image of a region near the south pole of Jupiter's volcanic moon Io. It was created by combining a black and white image taken with lower resolution color images. Two of these three calderas are surrounded by diffuse dark material, which may have been thrown out of the calderas by explosive eruptions.