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This is a photograph of Earth and the Moon taken from 1.44 billion km away, on July 19 2013.

Everyone you've ever known is living out their life here, on this little blue jewel, glittering faintly in the sunlight.

This tiny, delicate planet is all we have in the vastness of the Universe. Every living thing on it is part of our extended family.

All of us together, against a backdrop of unending darkness.

(Image credit: NASA/JPL-Caltech/Space Science Institute)