Using the Red Giant plugin for Adobe After Effects, I show you how to create a 3D Milky Way style galaxy you can fly through. 
The project file is included below. After some terrible singing and explainer at the start, I jump into After Effects and talk you through all the steps needed. First, we set up an emitter light and control its position using an expression to move it in a Fibonacci / Golden Spiral. Then we make the stars, followed by gas and finally dust as separate systems. Once completed, you have a 3D galaxy you can fly around.

Y = 0;
X = Math.sin(Math.PI*galaxySize)*Math.exp(galaxySize)*direction;
Z = Math.cos(Math.PI*galaxySize)*Math.exp(galaxySize)*direction;

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