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Re:The History of Joy Division’s “Unknown Pleasures” Album Art by waterlesscloud on Saturday May 18, 2013 @11:28AM (#5729226)
I happen to own a copy of the Cambridge Encyclopedia Of Astronomy (Doesn't everyone?).

There's no attribution credit for the image, though many other images in the book have such credits.

The caption does note, however, that the pulsar has a period of 1.337 seconds. I believe this makes it quite leet.

Re:The History of Joy Division’s “Unknown Pleasures” Album Art by xefer on Saturday May 18, 2013 @03:24PM (#5730026)
I too had a copy.

I remember when the album came out I immediately recognized the image, but I had no idea they had lifted it directly from the book itself. Now I wish I hadn't cut the picture out and taped it to the wall. :)