Creation of a star's corona

Hi there! I’m pretty new to this materials thing and was wondering how one would go about make a corona type effect that encircles an object/material. All help would be appreciated!

You can increase the color value on a material beyond 1, which will cause it to create a corona-like effect. Here’s an example of a sphere set to the colors Red: 1000, Green: 0, Blue: 0 on a black background. No lightning is used, but you may have to update the engine, as I remember they changed the way emissive colors display at some point.