secondly how do you make them? Here are some examples of what I'm talking about:
http://chandra.harvard.edu/photo/2010/ngc7793/stellar_bh_ill.jpg
http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs617.ash2/156969_1762167580828_1438257982_1956433_910974_n.jpg
