Europa: Linear Features from 246,000 kilometers | 9.13 | ||
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Voyager 2 view of part of Europa. Bright plains cover most of this view, with mottled terrain occupying the lower right. | ||
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Image Credit: JPL/NASA | |||
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The
first close look ever obtained of Jupiter's satellite, Europa, was taken
today, July 9, by Voyager 2 as the spacecraft approached the planet. The
linear crack-like features had been seen from a much greater distance last
March by Voyager 1. This picture was made at a range of 246,000 kilometers
and provides a resolution of about four kilometers. The complicated linear features appear even more like cracks or huge fractures in these images. Also seen are somewhat darker mottled regions which appear to have a slightly pitted appearance, perhaps due to small scale craters. No large craters (more than five kilometers in diameter) are easily identifiable in the Europa photographs to date, suggesting that this satellite has a young surface relative to Ganymede and Callisto, although not perhaps as young as Io's. |
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Various
models for Europa's structure will be tested during analysis of these images,
including the possibility that the surface is a thin ice crust overlying
water or softer ice and that the fracture systems seen are breaks in that
crust. Resurfacing mechanisms such as production of fresh ice or snow along
the cracks and cold glacier-like flows are being considered as possibilities
for removing evidence of impact events. Europa thus appears to truly be
a satellite with many properties intermediate between Ganymede and Io. |
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