Derrel has it in a nutshell. This is a while back, but I think it was an experiment in the vein of Weston, the "single item on a black background" still life thing, with a single softbox (?) and no fill of any sort, for drama.
Then I starting banging around and by over-sharpening I got this wild astronomical look and just went with it. Pushed the background totally flat, lots of local contrast. I didn't *shoot* it to look planetary, so I have to chalk any success up in that direction to serendipity.