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In this rare image taken on July 19, 2013, the wide-angle camera on NASA's Cassini spacecraft has captured Saturn's rings and our planet Earth and its moon in the same frame. NASA/JPL-Caltech/Space Science Institute hide caption

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NASA/JPL-Caltech/Space Science Institute

The moon, seen from the International Space Station, on July 31. NASA hide caption

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That little blue dot is how Earth will likely appear in a photo shot from a spacecraft that is studying Saturn. NASA/JPL-Caltech simulation hide caption

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NASA/JPL-Caltech simulation