GANYMEDE: PERSPECTIVE VIEWS
These six views show the relief of Ganymede from different perspectives. These renderings are made digitally by combining the original image mosaics with topographic maps of the surface. Vertical exaggeration in these views is 10 to 30 times normal.
Upper left: Dark terrain – Galileo Regio This observation of dark terrain is centered near the intersection of several furrows. The 1-to-2 kilometer deep furrows (or graben) are part of an ancient giant impact. Most features were originally deeper and have been modified by viscous creep of ice at higher temperatures than are prevalent now. Bright and dark materials are also partly segregated by downslope creep into bright slopes and peaks and darker valleys and low areas.
ENCOUNTER: Galileo G1 RESOLUTION: 77 meters/pixel
ENCOUNTER: Galileo G2 RESOLUTION: 90 meters/pixel
Upper right: Penedome crater Neith A 1-kilometer-high, 45-kilometer-wide central dome dominates Neith and surrounding ring of massifs but the crater rim normally present is mostly absent. Penedome craters like Neith no longer form today. The unusual morphology is related to higher heat flow in the ancient past of Ganymede and Callisto.
ENCOUNTER: Galileo G7 RESOLUTION: 140 meters/pixel
Center left: Bright terrain – Arbela Sulcus This view shows the truncation of a band of intensely faulted bright terrain (at top) by the smooth band of Arbela Sulcus in the foreground. Ridges are typically 200 meters high, the tallest almost 500 meters. The largest crater is ~500 meters deep and 2.5 kilometers across.
ENCOUNTER: Galileo G7 RESOLUTION: 180 meters/pixel
ENCOUNTER: Galileo G28 RESOLUTION: 132 meters/pixel
Center right: Central dome crater – Melkart Melkart, a 100-kilometer-wide central dome crater, is relatively young and well preserved. The central dome is ~30 kilometers wide and ~1 kilometer high. Domes like this, seen only on Ganymede and Callisto, may be material uplifted from several kilometers deep during impact, exposing Ganymede’s interior.
ENCOUNTER: Galileo G8 RESOLUTION: 180 meters/pixel
Lower left: Dark Terrain and Anshar Sulcus– Marius Regio Several generations of fracture sets cut across Marius Regio in this area, with the most prominent of these leading to the formation of the narrow lane of grooved or fractured bright terrain. Dark terrain features several craters 20 to 30 kilometers across that have been fractured and topographically relaxed.
ENCOUNTER: Galileo G8 RESOLUTION: 145 meters/pixel
Lower right: Bright and dark Terrain – Harpagia Sulcus This view shows the boundary between dark terrain (left) and bright terrain (right). Here the boundary has been faulted in several places as the icy crust has been stretched, forming relatively steep cliff walls several hundred meters high within both dark terrain and younger bright terrain.
ENCOUNTER: Galileo G28 RESOLUTION: 20 meters/pixel
Download a hi-res version of the image.