They're anomalies in the sense that I have no idea what would happen if you flew a star destroyer into a nebulae. Would it have a strategic advantage like blocking sensors and line of sight? Would it perhaps cause interference with communication? Or would the ship just melt and explode?
Plus, are there really fields of rocks and asteroides and such like in star wars? Perhaps around destroyed planets there would be? Like Peragus or something?
There are indeed questions of these nature to be clarified, because as it stands space as a battlefield is akin to a vast, empty, totally flat plain. Perhaps the addition of a few features would enhance it.
I have to remember that your not really advanced at Fleet RPing or apparently Astronomy before I continue. You have to remember that a Nebula is basically a gas cloud, so depening on what the gasses contain, it would block sensors, definitly interfere in line of sight, interference in communication, it would not cause the ship to explode, mainly because even if someone hit it with a turbolaser blast, there would be no oxygen for the gasses to ignite.
Yes, there are fields of rocks and asteriods. You should know, you are taking one over right now. Asteroid belts, rings, etc. Take for example, the Hoth Asteriod Belt, the Roche Asteriods, the Bridge, etc.
Just ask me any questions you have and I will do my best to answer them.