Only thing I can think of is Illustrator 9 or 10 with lots of transparency and gradient meshes and LOTS and LOTS of paths overlapping each other for areas where the gas becomes less than transparent.
You'd honestly be better off in Photoshop, if, however, you need a nebula that is infinitely scaleable like you get in Illustrator you could do it, but it would be a lot of work to make it look just right. Of course, you could always use Streamline on a real nebula image and get something halfway decent in a few minutes.
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