Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Last week, NASA released a map of Jupiter's largest moon made by the Galileo Orbiter highlighting ice and minerals deposits. The leftmost photograph by Voyager shows surface features in visible light, but the rightmost photograph , taken in infrared light by Galileo, shows the locations of minerals in red and ice grains in blue.
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