This is a very simple space picture, with one sphere, one light and is rendered
in camera view.
The background is starfield, azimuth 174, altitude 31, link to sun enabled. The
camera is set to
just inside of the sphere. The volumetric crab nebula is applied to the
sphere. The light intensity is set to 20 and
I used a light purple for the color.
The camera and light can be moved around to get the effect you are looking for.
I tried several
locations, settling on the above position. Below is the final rendering.
Crab Nebula