Meteor

Change the layer mode to Screen, and use your eraser tool to erase the center part of your meteor, so the zoom effect is only affecting the trail of the meteor.

Duplicate your main meteor layer again, and change the mode to color dodge. Use your circular selection tool to select the core of your meteor. Feather your selection by choosing Select > Feather, and entering a value of 5. Inverse your selection by choosing Select > Inverse, and press delete.

That's about it, here is how mine turned out.

Source: www.voidix.com