The viral Blue Marble 2012

Most Amazing High Definition Image of Earth - Blue Marble 2012, a photo by NASA Goddard Photo and Video on Flickr.

"A 'Blue Marble' image of the Earth taken from the VIIRS instrument aboard NASA's most recently launched Earth-observing satellite - Suomi NPP. This composite image uses a number of swaths of the Earth's surface taken on January 4, 2012. The NPP satellite was renamed 'Suomi NPP' on January 24, 2012 to honor the late Verner E. Suomi of the University of Wisconsin."

Click through for more info and a higher resolution version.

Here's a photo of the flip side.

And, here's an infographic on how the image was formed.

(I used the term 'viral' in the title because, in one day, this became the most viewed image on GSFC's Flickr stream.)