Graham Quince shows how to create a sun in Cinema 4D and take control of it for animation using some basic Xpresso. Check out the Creating a Sun in Cinema 4D & Animating it with Xpresso tutorial here.

from the tutorial description: In this tutorial, you will see a simple method for creating a star that is more than just a lens flare. Graham goes on to show you some basic Xpresso methods to make animating easier.