Voyager 2 holds the record for most celestial bodies observed in a single mission having flown by four planetary systems. Then of course Voyager 1 also became the first man-made interstellar object with Voyager 2 expected to do the same in 2016.
Print is Epson digital on archival Red River Polar White. Your final trim size will appear with a white border on a larger print sheet (5"x5", 11.75"x11.75" or 15.75"x15.75"). Does not include frame, but you can get it reasonably at any Ikea.