Space odysseys

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Saturn's rings and our planet Earth and its moon are seen in this image taken by the wide-angle camera on NASA's Cassini spacecraft July 19, 2013. Earth, which is 898 million miles (1.44 billion km) away in this image, appears as a blue dot at center right; the moon can be seen as a fainter protrusion off its right side. REUTERS/NASA/JPL-Caltech/Space Science Institute/Handout via Reuters