File:Comparison of Amalthea to Io.jpg

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Comparison_of_Amalthea_to_Io.jpg (471 × 404 pixels, file size: 30 KB, MIME type: image/jpeg)

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Composite view of Amalthea and Io at the same scale. The visible part of Amalthea is about 150 kilometers across. The colors are approximate. Amalthea is actually much darker than Io, but is displayed at a similar brightness for ease of viewing. The shape of Amalthea is controlled largely by impact cratering and fragmentation. In contrast, Io, like Earth, has gravity sufficient to form it into a slightly ellipsoidal sphere. Amalthea is covered by craters because there are no processes which erode or cover them efficiently. On extremely volcanically active Io, impact craters are covered quickly by lavas and other volcanic materials. Some of the volcanic materials escape from Io and probably contribute to the reddish colors of Amalthea and the other small inner satellites.

The Amalthea and Io composites, obtained by the solid state imaging (SSI) camera on NASA's Galileo spacecraft on different orbits, were placed side by side for comparison purposes. The Amalthea composite combines data taken with the clear filter of the SSI system during orbit six, with lower resolution color images taken with the green, violet, and 1 micrometer filters during orbit 4. The Io data was obtained on July 2nd, 1998 (orbit 14) using the green, violet, and 1 micrometer filters.
Date July 25
Source http://www.nasa.gov/
Author Cornell University
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current11:39, 25 July 2006Thumbnail for version as of 11:39, 25 July 2006471 × 404 (30 KB)Brallan~commonswiki (talk | contribs){{Information| |Description = Composite view of Amalthea and Io at the same scale. The visible part of Amalthea is about 150 kilometers across. The colors are approximate. Amalthea is actually much darker than Io, but is displayed at a similar brightness

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