Low-resolution
colour data were combined with a higher resolution mosaic to produce this
infrared composite image of a pair of ancient multi-ringed impact basins
on Jupiter's moon, Callisto. The region imaged is on the leading hemisphere
of Callisto near 26 degrees north, 142 degrees west, and is almost 1,400
kilometers across. North is toward the top of the picture and the Sun illuminates
the surface from the east. |
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Dominating
the scene is the impact structure, Asgard, centered on the smooth, bright
region near the middle of the picture and surrounded by concentric rings
up to 1,700 kilometers in diameter. A second ringed structure with a diameter
of about 500 kilometers can be seen to the north of Asgard, partially obscured
by the more recent, bright-rayed crater, Burr. The icy materials excavated
by the younger craters contrast sharply with the darker and redder coatings
on older surfaces of Callisto. |
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