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Open this photo up and look for the small, white dot just left of centre. It looks like Venus, shining brightly in the twilight sky. But it's us. It's Earth. From Mars.

This is NASA Photojournal image PIA17936, taken by the Curiosity rover some 80 minutes after sunset on Friday, 31 January 2014. At the time, our home 160 million kilometres away. Credit: NASA/JPL-Caltech/MSSS/TAMU