MESSENGER is the NASA mission to study the surface of Mercury. Launched in August of 2004, it made several flybys of Mercury before finally settling into orbit around the planet in March 2011.
Back in 2005, as MESSENGER passed by Earth one last time, it took a series of photos that researchers stitched together into a movie that I like a whole awful lot.
Comprising 358 frames taken over 24 hours, the movie follows Earth through one complete rotation. The spacecraft was 40,761 miles (65,598 kilometers) above South America when the camera started rolling on Aug. 2. It was 270,847 miles (435,885 kilometers) away from Earth - farther than the Moon's orbit - when it snapped the last image on Aug. 3.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.