Carl Sagan Carl Sagan

In 2013, NASA's Cassini spacecraft captured this image of Earth from Saturn. Seen here, our planet is 898 million miles away (1.44 billion kilometers) and appears as a blue dot at center right. NASA/JPL-Caltech/Space Science Institute hide caption

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NASA/JPL-Caltech/Space Science Institute

Your direct connection with the stars and all of the space in between them. iStockphoto.com hide caption

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iStockphoto.com