Excerpt from Gizmodo
Written by George Dvorsky
During a recent calibration exercise, NASA’s Mars Reconnaissance Orbiter captured a remarkable view of Earth and its moon from a distance of 127 million miles (205 million kilometers). It’s so clear, you can even make out our planet’s continents.
To calibrate the HiRISE camera aboard the Mars Orbiter, NASA scientists needed to scan an object other than the Red Planet. Seeing as Earth is right next door, that was an obvious choice.