The density of the gas/dust cloud is very low. It would be considered a fairly good vacuum; however, it would interact with the outer atmosphere of a planet, say, above 50 miles, and probably make the atmosphere unfavorable for the rise of life on the planet.
I was just envidioning what it must be like to live near, or in something like that. At night, walk out on the back deck and see this close up...be kinda cool wouldn't it?