I spent a bit of time looking around the Internet for something I could use to easily create a skybox with pretty stars, and perhaps nebulae as well. When I did this in the distant past, I would use 3DS Max and create a bunch of noise maps and layer them and fiddle with the settings until I got something halfway decent. I’m too old for that now. So, I looked around and, lo and behold, I discovered the Spacescape tool which was created by Alex Peterson. I used it to quickly create something that looks far better than anything I could have done in 3DS Max.
It looks great in Unity. Each side is 2K in resolution, which looks pretty decent on my 21:9 ultra-wide monitor that has a native resolution of 3440 x 1440.
I’m imagining that I will do different versions of this skybox, one for each race’s territory. Like the Spemin would probably have a skybox with green-yellow nebulae. Something like that. I do not know yet of Unity can blend between skyboxes, either automatically or by me blending texture maps manually. I’ll cross that bridge when I get to it.