I used the Universum image some time ago when trying out ideas for my website. I had uncharacteristically tidied up since, and couldn’t find a copy of the image, or its name, or the artist. All I had was an edited monochrome fragment in an old draft webpage. What I want, I said to myself, is the visual equivalent of one of those iPhone apps where you can record a snatch of a song and it will tell you what it is and where you can get it. After a brief google I came across Tin Eye (http://www.tineye.com) where I uploaded my image fragment and it pointed me to the very image at Wikimedia Commons which, I now remember, is where I got it from in the first place. I currently prefer the colourised version, but may use the original again sometime now I know where to find it.
I am sufficiently old to be overawed by the utter cleverness of this whole process, especially the guys at Tin Eye.