Step 1

Open blender and select your cube. Yes, select it; don’t delete it. Add a new materiel and use the settings I’m using:

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Play around with the settings, you’ll get endless different results, trust me. Seed randomized it, each number is a different effect. Try it; raise the number up one or two, or lower it, the result will be way different. Same with Flare. Experimenting is the key here.

Step 2

Now let’s make a star background. I played around and got a really realistic effect. Go to the World buttons and set the background color to black. And then enable stars.

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Set the size to 0.076. This will make it really small, and if you do a render you’ll hardly be able to see them, but let’s go on, thing’s get better.

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Set the StarDist to 3.7. This makes the distence between stars less, and gives it that relistic look, more of what you see when you look up into the sky at night, or pictures on Nasa.gov.

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Don’t forget to make sure your camera is centered, or the flare will be off-centered and the effect won’t be as good.

Examples

Here are several different renders I got, the first one what you should see, and the rest are ones I changed settings to get different results.

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