I've added all your new/modified icons to the trunk.
I'm still concerned that the amount of detail you are cramming into them will too-easily dissolve into noise, but at this point, clearly, something is better than nothing.
I quite like most of these icons, well done Silent One.
But I'm not keen on the artificial blackhole one. It doesn't really look like anything.
I can pull it apart into it's three component pieces (accretion disc, jets, icon), but I'm not keen on how it's been put together.
Couldn't you go for more of a "original" black-hole (big black whirlpool) and have a spanner in the corner to represent artificial? Thus skipping the jets (as most non-astronomy buffs won't recognise them I'd guess).
Thanks for your feedback. The problem with the black hole (and other tech icons as well) is that it needs to be recognizable at small sizes. Doing abstracted icons helps here. Still, when all other tech icons are finished, I may very well revise this one and try to achieve a more natural looking icon.
If I provided any images, code, scripts or other content here, it's released under GPL 2.0 and CC-BY-SA 3.0.