For only the third time ever, Earth has been photographed from the outer Solar System. At a distance of 898 million miles, as seen by NASA's Saturn-orbiting Cassini satellite, the Earth is a tiny, almost luminescent blue marble. If you zoom in (image below), you can even see the pale speck of the Moon next to Earth. As luck would have it, at almost exactly the same time, NASA's MESSENGER satellite also captured an image of the Earth and Moon -- this time from the inner Solar System, orbiting around Mercury (image below).