It's important to understand that this is a clever environmental map, not a 3D object in space or any kind of volumetric atmosphere. Take a look at this thread from a few months ago.
viewtopic.php?f=9&t=68523&p=344579&hili ... ry#p344579
We were exploring the Planetary Environment in Octane Studio, and while the C4D interface is slightly different, we dug pretty deeply into what's really going on, regardless of which host tool you are using.