http://books.nationalgeographic.com/map/map-day/index should be the link.

Is there a permalink?

Original artwork: http://books.nationalgeographic.com/map/map-day/2008/10/sola...

Someone extracted the image: http://www.flickr.com/photos/adamcrowe/4002050596/

I wonder what the original credits are though.

there is: http://books.nationalgeographic.com/map/map-day/2008/09/18

There's a full-size version of the image on Flickr here: http://www.flickr.com/photos/adamcrowe/4002050596/sizes/o/

It's easy enough to look up a list of missions to X on Wikipedia, but it'd be nice if the image included mission names.