Remove the stars from a Nasa image then make it 3D. 
In this tutorial, the first of four about creating nebulas in Adobe After Effects, I start by getting an image of the Horsehead nebula from Nasa's image galleries. I run it through Photoshop to remove the stars and background, using the Select Color Range, spot removal and background removal tools. Once cleaned, I drop it into After Effects and use CC Particle World to add dust, gases and 3D stars. 
Image credit: Nasa

if (time < thisComp.frameDuration) {
    effect("Stars Amount")("Slider")*40
} else {

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