This tutorial is 5 steps and it has a difficulty level of Easy. This tutorial will show you from start to finish how to make a star field quickly and easily.

     1. First create a new document, I'm going to use a 300 x 300 pixel image. Set your Foreground color to 000000 and go to Edit > Fill, and select Foreground Color. Press Ok. All colors in this tutorial are in hexadecimal (hex) value.

     2. Now, go to Filter > Noise > Add Noise. Set the Ammount to 30%, Set Distribution to Gaussion, and check Monochromatic. You should now have a lot of little dots all over your image. No, that is not the star field, keep reading . . .

     3. You now need to press Ctrl + L or go to Image > Adjustments > Levels. A new window should have come up with all kinds of stuff, Find Input Levels. Now, in the first box (should be automatically highlighted) it should currently say 0, if it doesn't, Ohh well because your changing it. Change the value to 135 and you should have a good looking star field like the one below.
Levels

Step 3

     4. Create a new layer by pressing Shift + Ctrl + N or go to Layer > New > Layer. Name the layer screen and then repeat steps 1-3 but instead of 135 as the value on step 3, set it to 180 or 190. And you should have something like the one pictured below.
Step 4

     5. Now set the screen layer's mode to Screen by using the layers pallet, you can bring it up by going to Window > Layers. Just select the screen layer and then where is says normal next to Opacity, click normal then go down to Screen and press that. Your star field should now look a tiny bit different, not much, but a little beter.
Step 5