Development of artwork, requests, suggestions, samples, or if you have artwork to offer. Primarily for the artists.
I last checked this behaviour in 0.4.7, will do a check in the latest release, then if the bug is still there post off to to Github in the next couple of days, along with a suggestion that a nova bomb can only be allowed in a starless system if included in a solar hull. I think any stuff about nebulas is beyond the scope of that bug. I am not currently familiar enough with the code to suggest a fix.